Fixing poor leakdown, Cyl 1 leaks at 50%, rest are cool. Options

[slowtwitch]

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]

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]

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]

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]

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]

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]

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]

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]

Nope, lapping did not work.

Did you try the bubble test to make sure that it is actually a head leak?

Zach

[gjones]

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]

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]

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

What did you have to do to finally fix your head leak?

[VaccaRabite]

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]

Need help this WE?

[VaccaRabite]

Sunday work for you? If so, YES.

Zach

[Jake Raby]

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]

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)