Twin plug update, Can i do it. |
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Twin plug update, Can i do it. |
904svo |
Mar 22 2010, 06:10 PM
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#1
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
While trying to make the jigs to drill my heads for twin plugs I ran into a
major problem. Where is the plug going to be located on the bottom of the head. I made up this jig to located where the plug will be located. Angle jig Test jig installed Installed Bottom view |
r_towle |
Mar 22 2010, 06:17 PM
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#2
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Custom Member Group: Members Posts: 24,624 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
There are pics here or on STF or Jakes site.
Jake has done this and he ended up in the same place, for the same reason. Rich |
Katmanken |
Mar 23 2010, 12:53 PM
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#3
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Nice idea for a jig.
It's quick and dirty and shows what is going on. |
Jake Raby |
Mar 23 2010, 01:07 PM
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#4
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Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The next problem you are going to have is how to get enough material in that location for the plug to seat.
You are about to see why this costs so much. And you'll still have to choose the plug carefully, make a socket to remove and install it and find the perfect spark plug wire for the lower set of plugs.. Have fun |
RJMII |
Mar 23 2010, 04:55 PM
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#5
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
The next problem you are going to have is how to get enough material in that location for the plug to seat. You are about to see why this costs so much. And you'll still have to choose the plug carefully, make a socket to remove and install it and find the perfect spark plug wire for the lower set of plugs.. Have fun That sounds like experience talking. |
Katmanken |
Mar 23 2010, 07:10 PM
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#6
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
It's a little daunting trying to drill two angled holes in each head when each hole is at a different angle to each of the x axis, the y axis and the z axis, and not parallel or perpendicular to anything on the head.
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904svo |
Mar 23 2010, 09:18 PM
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#7
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
It's a little daunting trying to drill two angled holes in each head when each hole is at a different angle to each of the x axis, the y axis and the z axis, and not parallel or perpendicular to anything on the head. Thats why I'm making jigs up to locate the holes, and yes it hard to drill the hole but my mill can handle it after I modify it. After I'm done I can modify a good set of heads. |
RJMII |
Mar 23 2010, 09:21 PM
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#8
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
It's a little daunting trying to drill two angled holes in each head when each hole is at a different angle to each of the x axis, the y axis and the z axis, and not parallel or perpendicular to anything on the head. Thats why I'm making jigs up to locate the holes, and yes it hard to drill the hole but my mill can handle it after I modify it. After I'm done I can modify a good set of heads. I hope you're able to figure it out, that's a pretty cool project. not anything i'd use (v6 car here) but it's sure cool to watch your progress. |
904svo |
Mar 23 2010, 09:22 PM
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#9
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
This is the engine I'm going to try them on. My version of a type 547 engine
The fan does cool the engine. |
URY914 |
Mar 24 2010, 06:31 AM
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#10
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I built the lightest 914 in the history of mankind. Group: Members Posts: 123,006 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
What are you hoping to gain from all this?
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904svo |
Mar 24 2010, 07:20 AM
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#11
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
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ME733 |
Mar 24 2010, 09:03 AM
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#12
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
.I think that , based on some old 4-cam carrera information., a twin plug engine -a type 4-engine, could see a 5-to 15 percent increase in H.P....the more radical the engine the higher H.P. potential.-to a 15% increase....MM
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URY914 |
Mar 24 2010, 11:48 AM
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#13
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I built the lightest 914 in the history of mankind. Group: Members Posts: 123,006 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
What are you doing for a dizzy?
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904svo |
Mar 24 2010, 11:54 AM
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#14
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
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HAM Inc |
Mar 24 2010, 12:01 PM
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#15
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
The heads will require lots of welding to accomodate the second set of plugs. Having done this to several pairs I can tell you from experience that it is a lot of work. Like Jake said there is a reason that it is expensive.
Good luck Larry! |
URY914 |
Mar 24 2010, 12:04 PM
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#16
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I built the lightest 914 in the history of mankind. Group: Members Posts: 123,006 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
What are you hoping to gain from all this? So I can say "I did it." Good enough (IMG:style_emoticons/default/biggrin.gif) |
Todd Enlund |
Mar 24 2010, 12:11 PM
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#17
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Resident Photoshop Guru Group: Members Posts: 3,251 Joined: 24-August 07 From: Laurelhurst (Portland), Oregon Member No.: 8,032 Region Association: Pacific Northwest |
Curious... why a bus head? Are you planning a lot of other machine work as well?
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904svo |
Mar 24 2010, 02:58 PM
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#18
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
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tat2dphreak |
Mar 24 2010, 03:15 PM
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#19
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
isn't that angle going to be REAL close to the Exhaust?
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Dave_Darling |
Mar 24 2010, 03:28 PM
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#20
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
.I think that , based on some old 4-cam carrera information., a twin plug engine -a type 4-engine, could see a 5-to 15 percent increase in H.P....the more radical the engine the higher H.P. potential.-to a 15% increase....MM In the 911 engines, going dual-plug generally lets you run about one full point more of compression on the same grade of fuel without detonation. A fair bit of the extra power comes from the extra compression, from what I can tell. The 914 chambers are very different from the 911 ones; not sure how much (if any?) more compression you can run in them. --DD |
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