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Since I have to take the head off again /bcforum/images/%%GRAEMLIN_URL%%/wall.gif and probably have it slightly shaved. I think I want to raise the compression ratio a bit.
First of all, I am taking the head off because it turns out the head gasket is junk. Serves me right for using it, I wasn't real happy with it in the first place but the spare head gasket turned out to be for a 1200 engine and I have a 1300. Anyway, the bad head gasket explains allot of the bad behavior of my engine since I rebuilt it all of 15 km ago.
Now I doubt that the head is actually warped, but I don't exactly want to find out that it is after I reassemble it with a new gasket so off to the machine shop for a quicky skim.
That raises the question if I shouldn't raise the cr ratio altogether. The engine was originally a low compression engine (7.5:1) for the low octane fuel available here at the time. I rebuilt it with flat pistons instead of the original dished pistons so that will raise the CR ratio a tiny bit, but it is still way under the 8.5:1 of the standard engine.
How high can a safely raise the CR? fuel here is European 95 octane (similar to regular in the US). I could easily shave as much as 2 mm off of the head, which would put the cr up to around 1:9, according to Teglerizer's web site, and there would still be enough adjustment available in the valve adjusters to set the gap correctly.
How high should I go? I want a reliable street engine which will run on regular gas in the end.
First of all, I am taking the head off because it turns out the head gasket is junk. Serves me right for using it, I wasn't real happy with it in the first place but the spare head gasket turned out to be for a 1200 engine and I have a 1300. Anyway, the bad head gasket explains allot of the bad behavior of my engine since I rebuilt it all of 15 km ago.
Now I doubt that the head is actually warped, but I don't exactly want to find out that it is after I reassemble it with a new gasket so off to the machine shop for a quicky skim.
That raises the question if I shouldn't raise the cr ratio altogether. The engine was originally a low compression engine (7.5:1) for the low octane fuel available here at the time. I rebuilt it with flat pistons instead of the original dished pistons so that will raise the CR ratio a tiny bit, but it is still way under the 8.5:1 of the standard engine.
How high can a safely raise the CR? fuel here is European 95 octane (similar to regular in the US). I could easily shave as much as 2 mm off of the head, which would put the cr up to around 1:9, according to Teglerizer's web site, and there would still be enough adjustment available in the valve adjusters to set the gap correctly.
How high should I go? I want a reliable street engine which will run on regular gas in the end.
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