Flywheel for 6-conversion to 901 gearbox, Vendors disagree on part no. |
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Flywheel for 6-conversion to 901 gearbox, Vendors disagree on part no. |
rwfms |
Mar 6 2017, 09:30 PM
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#1
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Newbie Group: Members Posts: 17 Joined: 4-January 06 From: Wichita, KS Member No.: 5,365 |
I bought a new 901-102-026-01 OEM flywheel which was recommended for a 6 conversion using the stock 901 gearbox. After 7000 miles the ring gear is toast but the starter gear looks ok. I suspect the problem is with the starter/starter gear. While searching for a new flywheel I found vendors don't necessarily agree on the part number. One vendor carries only the -01 wheel specifically for this application. The other vendor carries a -01 and a -02, both OEM, and insists the -02 is the only one that fits. Anyone know if there is a difference in the two wheels or is it just a vendor numbering issue? Also any thoughts on the ring gear problem?
If anyone has a new or like new flywheel for this app you are looking to sell, I'm in the market. Thanks Ron |
wndsrfr |
Mar 7 2017, 06:27 AM
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#2
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Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
I bought a new 901-102-026-01 OEM flywheel which was recommended for a 6 conversion using the stock 901 gearbox. After 7000 miles the ring gear is toast but the starter gear looks ok. I suspect the problem is with the starter/starter gear. While searching for a new flywheel I found vendors don't necessarily agree on the part number. One vendor carries only the -01 wheel specifically for this application. The other vendor carries a -01 and a -02, both OEM, and insists the -02 is the only one that fits. Anyone know if there is a difference in the two wheels or is it just a vendor numbering issue? Also any thoughts on the ring gear problem? If anyone has a new or like new flywheel for this app you are looking to sell, I'm in the market. Thanks Ron Just had the same thing happen to me, wonder if there's a bad batch of flywheels out there.... is your starter o.e. type or not? |
IronHillRestorations |
Mar 7 2017, 06:37 AM
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#3
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I. I. R. C. Group: Members Posts: 6,759 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
I'll bet you are not using a Bosch starter.
"I'll take Hi-Torque starters for $1000 Alex" BTDT, get a factory starter. |
gereed75 |
Mar 7 2017, 07:50 AM
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#4
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Senior Member Group: Members Posts: 1,282 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
What is the deal on hi torque starters. I just started using one as they seem widely accepted. Had not heard there was an issue. Wha's up?
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6freak |
Mar 7 2017, 08:12 AM
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#5
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
I never could understand why someone would use them with a stock engine when the stock works very! and at 1K (IMG:style_emoticons/default/screwy.gif)
(IMG:style_emoticons/default/smile.gif) |
jd74914 |
Mar 7 2017, 08:21 AM
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#6
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Its alive Group: Members Posts: 4,796 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
IIRC some of the high-torque starters have gear engagement depth problems and need to be shimmed.
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Root_Werks |
Mar 7 2017, 09:03 AM
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#7
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Village Idiot Group: Members Posts: 8,416 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest |
I bought a new 901-102-026-01 OEM flywheel which was recommended for a 6 conversion using the stock 901 gearbox. After 7000 miles the ring gear is toast but the starter gear looks ok. I suspect the problem is with the starter/starter gear. While searching for a new flywheel I found vendors don't necessarily agree on the part number. One vendor carries only the -01 wheel specifically for this application. The other vendor carries a -01 and a -02, both OEM, and insists the -02 is the only one that fits. Anyone know if there is a difference in the two wheels or is it just a vendor numbering issue? Also any thoughts on the ring gear problem? If anyone has a new or like new flywheel for this app you are looking to sell, I'm in the market. Thanks Ron If I remember correctly, the only difference is the marks. An early 911 flywheel works fine, but doesn't have the additional marks for adjusting valves. |
rudedude |
Mar 7 2017, 09:17 AM
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#8
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Senior Member Group: Members Posts: 515 Joined: 1-January 05 From: minneapolis, mn Member No.: 3,387 Region Association: Upper MidWest |
Had the same issue with my stock flywheel when I used the high torque starter for new high compression motor. Now back to stock starter which works fine with new flywheel.
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brant |
Mar 7 2017, 09:47 AM
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#9
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914 Wizard Group: Members Posts: 11,738 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
What is the deal on hi torque starters. I just started using one as they seem widely accepted. Had not heard there was an issue. Wha's up? I've had 3-4 different hi torque starters over the years The better ones all work perfectly it was one of the cheap, ebay versions that used to sell for around 100bucks it had basically the wrong nose cone, which allowed the engagement depth to be too deep. I believe the OP will verify, that it is the inboard ring gear teeth edge that are gone/50%gone. you can hold your hi torque up to a stock starter or better hi torque starter and see the difference in plunge depth of the bendix when pulled out to full extension if it throws too far out, or too deep when compared to stock..... then you need a shim on the mounting surface. Some of these starters actually came with this correct shim I have one with the shim on my street car that has now been used for many many years. |
IronHillRestorations |
Mar 7 2017, 12:19 PM
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#10
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I. I. R. C. Group: Members Posts: 6,759 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
I really do like the idea of a lighter weight more powerful starter.
I'm not 100% sure I could tell you which one will or will not eat your flywheel, so I don't recommend them. To carry the banner for our dear departed Crusty one, I've never had a Bosch starter lunch a flywheel, and I wouldn't buy anything else. If you bring me your car and XYZ starter I'll put it on, but that's it. |
rwfms |
Mar 7 2017, 05:43 PM
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#11
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Newbie Group: Members Posts: 17 Joined: 4-January 06 From: Wichita, KS Member No.: 5,365 |
I bought a new 901-102-026-01 OEM flywheel which was recommended for a 6 conversion using the stock 901 gearbox. After 7000 miles the ring gear is toast but the starter gear looks ok. I suspect the problem is with the starter/starter gear. While searching for a new flywheel I found vendors don't necessarily agree on the part number. One vendor carries only the -01 wheel specifically for this application. The other vendor carries a -01 and a -02, both OEM, and insists the -02 is the only one that fits. Anyone know if there is a difference in the two wheels or is it just a vendor numbering issue? Also any thoughts on the ring gear problem? If anyone has a new or like new flywheel for this app you are looking to sell, I'm in the market. Thanks Ron Just had the same thing happen to me, wonder if there's a bad batch of flywheels out there.... is your starter o.e. type or not? OE Bosch 003 911 023A was on the car. Not sure if it is a 914 starter or a starter off a '69 911, I had both. |
rwfms |
Mar 7 2017, 05:57 PM
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#12
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Newbie Group: Members Posts: 17 Joined: 4-January 06 From: Wichita, KS Member No.: 5,365 |
I bought a new 901-102-026-01 OEM flywheel which was recommended for a 6 conversion using the stock 901 gearbox. After 7000 miles the ring gear is toast but the starter gear looks ok. I suspect the problem is with the starter/starter gear. While searching for a new flywheel I found vendors don't necessarily agree on the part number. One vendor carries only the -01 wheel specifically for this application. The other vendor carries a -01 and a -02, both OEM, and insists the -02 is the only one that fits. Anyone know if there is a difference in the two wheels or is it just a vendor numbering issue? Also any thoughts on the ring gear problem? If anyone has a new or like new flywheel for this app you are looking to sell, I'm in the market. Thanks Ron If I remember correctly, the only difference is the marks. An early 911 flywheel works fine, but doesn't have the additional marks for adjusting valves. Thanks! |
914Sixer |
Mar 7 2017, 07:10 PM
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#13
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914 Guru Group: Members Posts: 8,987 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
I prefer the 74- up 911 starter. The starter is 1.5 hp, almost twice the horsepower of the .8 stock starter. Plug and play. It is best to up the gauge of the cable from the battery to the starter when you make the upgrade.
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rwfms |
Mar 7 2017, 08:44 PM
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#14
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Newbie Group: Members Posts: 17 Joined: 4-January 06 From: Wichita, KS Member No.: 5,365 |
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porschetub |
Mar 8 2017, 12:52 AM
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#15
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Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
(IMG:style_emoticons/default/agree.gif) the starter stock is more than enough,Bosch make great starters when I reconditioned them years ago most only needs a clean and lube,the worst I found needed commutator machined and new brushes and these were old starters back then,save the reduction high torque starters for high comp petrol motors and diesels (IMG:style_emoticons/default/dry.gif) .
Sounds like the OP may have had a flywheel with no induction hardened teeth...easy to check with a hand file the tips should be bloody hard. |
rwfms |
Mar 8 2017, 12:46 PM
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#16
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Newbie Group: Members Posts: 17 Joined: 4-January 06 From: Wichita, KS Member No.: 5,365 |
(IMG:style_emoticons/default/agree.gif) the starter stock is more than enough,Bosch make great starters when I reconditioned them years ago most only needs a clean and lube,the worst I found needed commutator machined and new brushes and these were old starters back then,save the reduction high torque starters for high comp petrol motors and diesels (IMG:style_emoticons/default/dry.gif) . Sounds like the OP may have had a flywheel with no induction hardened teeth...easy to check with a hand file the tips should be bloody hard. Thanks for the tip. I'll let you know when I get the gearbox out. Ron |
Larmo63 |
Mar 8 2017, 02:51 PM
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#17
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Advanced Member Group: Members Posts: 4,267 Joined: 3-March 14 From: San Clemente, Ca Member No.: 17,068 Region Association: Southern California |
With regards to the original question, on my 2.7 build, should I go Kennedy for the flywheel, PP, TOB, clutch, etc, or buy OG Porsche stuff?
6 bolt flywheel, stock 901 gearbox. I've gotten various opinions. |
mepstein |
Mar 8 2017, 03:25 PM
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#18
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914-6 GT in waiting Group: Members Posts: 19,511 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
We buy a fair amount of those type of parts from kep. Always works out well.
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forrestkhaag |
Mar 8 2017, 07:30 PM
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#19
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Senior Member Group: Members Posts: 935 Joined: 21-April 14 From: Scottsdale, Arizona Member No.: 17,273 Region Association: Southwest Region |
For what it is worth, I bought the KEP product as to clutch, t/o, etc with the correct ring gear for my 901 (on recommendation from Steve after years of his use ((on a 915)) w/o issue).
It bolted up to my 911 3.0 and starter motor and the 901 w/o issue. Now to actually start the beast.... (IMG:style_emoticons/default/beerchug.gif) Is there an emoticon for scared shitless?... (IMG:style_emoticons/default/av-943.gif) |
porschetub |
Mar 9 2017, 12:36 AM
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#20
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Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
(IMG:style_emoticons/default/agree.gif) the starter stock is more than enough,Bosch make great starters when I reconditioned them years ago most only needs a clean and lube,the worst I found needed commutator machined and new brushes and these were old starters back then,save the reduction high torque starters for high comp petrol motors and diesels (IMG:style_emoticons/default/dry.gif) . Sounds like the OP may have had a flywheel with no induction hardened teeth...easy to check with a hand file the tips should be bloody hard. Thanks for the tip. I'll let you know when I get the gearbox out. Ron Sorry to seem forgetful but did we work out what your engine was ,sorry but never googled your part number for the flywheel presume a 6 bolt ? |
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