Fixing poor leakdown, Cyl 1 leaks at 50%, rest are cool. |
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Fixing poor leakdown, Cyl 1 leaks at 50%, rest are cool. |
slowtwitch |
Jan 11 2008, 08:43 AM
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#121
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Newbie Group: Members Posts: 3 Joined: 17-March 05 From: Andalusia, PA Member No.: 3,774 |
GE is a bus case. GA is the 2.0 914 case. I only know as the case my engine is built on is a GE bus case. There are a few things that you need to do in order to use a GE case in a 914. Most important is a block off plate for one of the oil galleys. Zach Zach, My bad... That is a GA case. I wanted to use it for a stroked 2.0 build, but, after doing the carbon paper trick and checking the deck heights, I went with an older W case. pete |
VaccaRabite |
Jan 11 2008, 08:58 AM
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#122
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En Garde! Group: Admin Posts: 13,554 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Okay, just talked to Josh on the phone, and I am going to get his case and flywheel sometime next week.
I love this place. Zach |
orange914 |
Jan 12 2008, 12:24 AM
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#123
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
First of all, I want to say hi 914world, This is my first post here. the one problem that I see, is the difference in the amount of material in the register areas, between the 2.0 GE cases and 1.7 EA/W cases. Here a shot of a GE 2.0 case... and here's a shot of a 1.7 EA case... Seems like VW wanted to save a couple of bucks in material cost (IMG:style_emoticons/default/biggrin.gif) pete (IMG:style_emoticons/default/welcome.png) does the GE case have the groves for the windage tray? i think all 914 cases do although the EA 1.7 didnt have a windage tray, just the groves. i wonder if the GA's are thin at the registers like the GE's?? mike |
slowtwitch |
Jan 12 2008, 05:02 PM
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#124
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Newbie Group: Members Posts: 3 Joined: 17-March 05 From: Andalusia, PA Member No.: 3,774 |
First of all, I want to say hi 914world, This is my first post here. the one problem that I see, is the difference in the amount of material in the register areas, between the 2.0 GE cases and 1.7 EA/W cases. Here a shot of a GE 2.0 case... and here's a shot of a 1.7 EA case... Seems like VW wanted to save a couple of bucks in material cost (IMG:style_emoticons/default/biggrin.gif) pete (IMG:style_emoticons/default/welcome.png) does the GE case have the groves for the windage tray? i think all 914 cases do although the EA 1.7 didnt have a windage tray, just the groves. i wonder if the GA's are thin at the registers like the GE's?? mike Thanks for the welcome. I think i have a couple GE cases in the garage, I'll check tomorrow. I checked 2 CB cases, that i have in the basement shop and found that one has the stout register and the other does not... pete |
Jake Raby |
Jan 12 2008, 11:38 PM
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#125
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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 register difference is not for specific case codes, but more from different casting runs.. This is the reason why I build all my high output and race engines from 1.7 cases that have the added material behind the register...
All cases after the W0 series had the windage tray, no matter if they were for a 914 or a Bus. The GE case does have a windage tray slot, but it uses a short oil pick up tube that needs to be modified to attach the windage tray to it. |
orange914 |
Jan 17 2008, 03:20 PM
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#126
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
I hope Jake tells us more about what and WHY is going on with these 2.0 blocks. He is the only one I know that actually has the answers. Me... I'm just doing a bit of guess work and trying to surmise the facts. He knows the facts. Clayton Here a shot of a GE 2.0 case... (IMG:http://i46.photobucket.com/albums/f109/slowtwitch/GBcase.jpg) and here's a shot of a 1.7 EA case... (IMG:http://i46.photobucket.com/albums/f109/slowtwitch/EAcase.jpg) Seems like VW wanted to save a couple of bucks in material cost (IMG:style_emoticons/default/biggrin.gif) pete heres a shot of my g.a. case. i guess g.a.'s are thin too. what were they thinking? G.E. and G.A. they got cheap on and E.A. lower h.p. was thicker? |
904svo |
Jan 17 2008, 03:42 PM
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#127
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904SVO Group: Members Posts: 1,124 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
First of all, I want to say hi 914world, This is my first post here. the one problem that I see, is the difference in the amount of material in the register areas, between the 2.0 GE cases and 1.7 EA/W cases. Here a shot of a GE 2.0 case... and here's a shot of a 1.7 EA case... Seems like VW wanted to save a couple of bucks in material cost (IMG:style_emoticons/default/biggrin.gif) pete (IMG:style_emoticons/default/welcome.png) does the GE case have the groves for the windage tray? i think all 914 cases do although the EA 1.7 didnt have a windage tray, just the groves. i wonder if the GA's are thin at the registers like the GE's?? mike Thanks for the welcome. I think i have a couple GE cases in the garage, I'll check tomorrow. I checked 2 CB cases, that i have in the basement shop and found that one has the stout register and the other does not... pete Andalusia,Pa Thats where I grew up and when to school many,many years ago. Use to live on Locust Ave, then 95 made us move. Is the Speed shop still on Bristol Pike? Use to work for them when I was a teenager. |
gjones |
Jan 20 2008, 10:26 AM
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#128
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Newbie Group: Members Posts: 11 Joined: 18-January 08 From: Texas Member No.: 8,592 |
So, at the Sterling meet I did a leakdown test on my motor, and found a problem with Cylinder 1. 45% leakdown, but 120 lbs of compression. Was tempted just to let sleeping dogs lie, but pulled the head off. What was going on was clear as soon as we did that, the head was not totaly sealed to the cylinder, off by a very small amount. Instead of having the head recut, I decided to try and lap the two of them together. So, last night I hand lapped them, using ground graphite to check for even contact. I got good contact after the third round of hand lapping (lap, clean, check). Now I need to get the jug back on the block. I have a ring compressor on the piston, but I can't ficgure out how to get the head back on. Do I have to take the piston head off the rod? If so, how do I get it off. It looks like that tis a spring keeper that needs to be removed. Is there anyhting on the rod the needs to be loosened before I can pull the pin out to remove the piston head? Obviously, if there is a trick to getting the jug back on without pulling off the piston head, I'd like to do that. Zach Did lapping it ever resolve the issue- I believe I have the same situation?? |
VaccaRabite |
Jan 20 2008, 11:15 AM
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#129
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En Garde! Group: Admin Posts: 13,554 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Nope, lapping did not work.
Did you try the bubble test to make sure that it is actually a head leak? Zach |
gjones |
Jan 20 2008, 09:49 PM
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#130
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Newbie Group: Members Posts: 11 Joined: 18-January 08 From: Texas Member No.: 8,592 |
Nope, lapping did not work. Did you try the bubble test to make sure that it is actually a head leak? Zach No I did not- when I do the leak down no air comes out of the intake and the exhaust valves. When it is running I can cup the carb throat completely and it doesn't stumble or choke out at all. Checked for vaccum leaks none found- just don't know what else it could be??????? |
VaccaRabite |
Jan 20 2008, 11:26 PM
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#131
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En Garde! Group: Admin Posts: 13,554 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Do a leak down test. While you are pressurizing the cylinder, squirt some windex (or other liquid spray cleaner) at the joint. If you see bubbles, that is where the leak is. It is an easy test.
Zach |
gjones |
Jan 25 2008, 06:35 PM
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#132
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Newbie Group: Members Posts: 11 Joined: 18-January 08 From: Texas Member No.: 8,592 |
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VaccaRabite |
Jan 25 2008, 07:10 PM
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#133
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En Garde! Group: Admin Posts: 13,554 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I did 2 things.
1) I had the half with the droppy registers fixed (case decked). Cheap work, especially if you pull the studs first. 2) I got a second case. I have yet to rebuild my engine, as I got my stuff back from the machineist today. I decided to give my old case one more try, as it had the galley plug mod done, and the machineist said he could deck it cheap. If it is still wonky, I am going to use the second case and be done with it. Zach |
Dr Evil |
Jan 25 2008, 08:47 PM
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#134
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Send me your transmission! Group: Members Posts: 23,032 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Need help this WE?
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VaccaRabite |
Jan 26 2008, 12:46 AM
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#135
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En Garde! Group: Admin Posts: 13,554 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Sunday work for you? If so, YES.
Zach |
Jake Raby |
Jan 26 2008, 12:48 AM
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#136
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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 |
So you only decked one case half??
If so now you'll have to do rocker geometry on BOTH halves and will have to set CR seperately as well, needing more shim on the decked side. I'd never deck just one case half- if one half has droop syndrome, the other is close behind. |
Dr Evil |
Jan 26 2008, 09:42 AM
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#137
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Send me your transmission! Group: Members Posts: 23,032 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
He was gonna have to do geo on both anyway. I already gave him some adjustable rods.
Zach, cant do Sun, I am going wedding ring shopping with the lil woman (IMG:style_emoticons/default/smile.gif) |
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