I'm having a go at screwing together a 1776 for everday use. What compression ratio do i need to run. Doing the measurements it is currently at 9:1. How do i go about raising it or lowering it. Thanks Aaron
Am Interested to see if u r happy with the 1776 why have you selected a 1776
was it just a displacment change or other things as well?
Had a 1776 built afew years ago by a reputed vw specialist. Had too much end float movement from when it was built. Had about 1000miles on it. Stripped it down and couldn't find anyone to put it back together. Lots of brand new parts. So having a go myself. just need to be pointed in the right direction. Aaron
So it's stockfish or big cam, heads etc?
Counterweighted balanced?
And how have you worked out the c.r?
Basically stock. Aaron
spacers under the barrels or "flycutting' the heads or combo of both
What compression ratio do i need? Aaron
Anyone with some tech advice on what ratio I should use. What does it depend on.
low 8's??
9 is a tad high for a stockish motor - but what would I know
It all depends on the cam, heads, valve size, deck height and a whole heap of experience.
Did you cc the heads??
Futue te ipsum!!!
Go 14.5:1 and you'll just love it 🙂
I lie.
As all above have mentioned, A good strong engine is the sum of it's parts, rather than one standout performance enhancement.
IMO a stockish 1776 would benefit from somewhere between 8 and 8.5:1 compression. It should give it that extra zap without causing too much stress to the engine.
That said, I could be so far wrong It's not funny!
Ollie
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My old 1776 with stock bottom end, mild port and polish and W100 cam had about 8.5/9 ish.
But in the end, that was selected by the engine builder based on the engine combo.
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
I worked out the ratio by
cyl volume + head volume + deck height volume
_______________________________________
head volume + deck volume
Stroke = 69mm
I am getting confused. Am i going to to much trouble. Just bolt the barrels down and forget about it. Thanks Aaron
check your answer against this calculator
http://www.aircooled.net/gnrlsite/resource/specgeninfo/calcs.htm
We are just saying 9 is on the high side
You could put a small spacer under the barrels or open the heads up a bit
The spacer mucks you deck height up and that mucks "squish" up
You could whack it all together and see what happens - you might just have to run 98 octane to keep pinging at bay
Futue te ipsum!!!
Impossible to say without knowing what cam you've got.
Bizarre, I used the calculator and came up with a figure of 8:1 ratio. I think I am going to go with just bolting everything up as is. There was a lot more involved to this topic than I thought. Thanks for the help guys. Aaron
i think that you could run upto 8.5 for every day use if it was built right
but im no engine builder!
jus go for it and see what happens
Only way to learn 👍
Futue te ipsum!!!
