[RallyBob]

A big valve 1.5 head, showing the excessive unshrouding required to improve airflow.

Bob

 

[RallyBob]

Now compare it to a 1.9 head with the same sized valves, you can really see the difference it makes in compression ratio. This is the same head that was shown in the old thread on cylinder heads (although those photos were lost in the transfer to our new bulletin board).

Bob

 

[Gary]

Another thing on the

To Do

list...

That was a great thread. I will reconstruct it!

 

[opeldean]

1.9 cylinder head rebuild

what can be done to a stock 1.9 cylinder head to upgrade it for a stock 9-1 compression engine and can be completed in a week or 2 of "off" time.
1- budget of $500 or less
2- budget of $1,000 or less

*a used 2.0 head sells for $650 at ogts..but there are none currently.
*a 2.2 engine or cylinder head seems to change a lot of things and it seems a much bigger project

3-choose valves ..chevy verses opel 2.0 valves
4-choose cam- ogts verses split profile
5- where to port and how much..photo would be nice
6- anything else i need to know
7- reliabilty for a daily driver

thanks

 

[jeff denton]

Gee, Bob, it sure would be cool to try your 1.5 head on Speedway GT once...
It isn't exactly legal, but who would know?
I recall you writing somewhere that it just isn't possible to find a 1.5 head, let alone buy one.
I find impossible to just be a good challenge.
Surely somebody must know where I could get one....

 

[RallyBob]

Gee, Bob, it sure would be cool to try your 1.5 head on Speedway GT once...
It isn't exactly legal, but who would know?
I recall you writing somewhere that it just isn't possible to find a 1.5 head, let alone buy one.
I find impossible to just be a good challenge.
Surely somebody must know where I could get one....

Jeff, it's actually far easier to find a 1.6 head from Europe (same head as a 1.5, but with 4 cam bearings). I used these for circle-track Opels for years due to the stiffer valvetrain from the 4th bearing.

1.5's are a one-year proposition here, 1968 only (some are cast in 1967 though). In Europe, the 1.6 was used for a longer period of time, and due to the higher gas costs, not everyone went for the 1.9 engines.

Sadly, the recent surge in the Euro's value has rendered all stuff from Europe quite a bit more expensive.

Bob

 

[jeff denton]

Thanks, Bob. I wasn't aware of the 1.5 being triple bearing. We like the four bearing version, and have come up with an external cam bearing oiling system that I think will work. I'll do some research on the 1.6!!