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I typed in 1mm skim so just put the gasket as .2 instead of 1.2 and minus 4cc per cylinder so 21 cc and calculator showed 11.42

Right, re calculation then. 1mm head skim, - 4 cc in combustion chambers (21) = 11.72 -1. Spot on ideal ratio. 1mm skim sounds ideal

Quick calculation, as you stated Frank 23 thou isn't much and that would only up the comp ratio to 10.1-1 . Where as a 2 mm skim takes it to 11.71-1. Much better. Or now with 1.0 l pistons 15-1 boom. Thanks again. Interesting

Spot on thankyou Frank! If I was to put 1 l flat top pistons in with 0 dome the comp ratio would rise to 11.74-1. That would be a nice increase don't you think. Ill becontacting the original owner of my micra later to pick his brains on what's actually been done to the engine. It may be a case...

Been looking at the thread 1275 recommended. Very interesting cheers fella

Yes lowrider I would be interested in power figures once done. Bit of an addict with rolling roads. If my car could get 125 bhp with power coming in from around 3 onwards that would be nice without the torque dip. As the car has a 5.1 cwp fitted it should accelerate pretty good then ( for a...

Frank was the really helpful member (Y) but just thought I'd ask the other members. I ideally don't want to rebuild the entire engine but just pop the head off and give it a skim. Got rally on epynt the end of this month and going to do it after that. Putting an entry in for Wales rally gb at...

Hola, I've been told that my micra needs to have the compression ratio raised to increase the torque of my engine. The car has a flat spot/torque dip at 4000 rpm. The car has 1.6 inj, cup cams (?) fse regulator, exhaust n gpa filter and is making 95@ wheels. I was told by my rolling road...

Yeh it's torque that makes the car quick, not mega rpm unless you got mega close ratio box. If I do up the comp ratio it should utilise the cams to their full potential. Will delv deeper before I get head off

So that's 12.5-1. Bet it's really responsive. Last time I upped comp ratio from 9.3 to 11.1-1 it was loads more grunt, much more responsive and put out lots more fumes from exhaust. Made your trousers shake if stood behind the car.:laugh:

Do you think 7k rpm is safe?? The car lives at high rpm every time I use it as rally car cheers

If you have skimmed the head 3mm then maybe the guy I spoke to had the figures wrong. Was the engine reliable? Did it detonate at lower revs or you using super unleaded etc. Sorry about all the questions but had so many engine issues in my escort, in out rebuild etc. Measure twice cut once haha.

Still a fair bit of work then. Was hoping a quick head skim and few bits and pieces for about £500 tops? Spent ages developing my duratec in escort and ended up with 232bhp but spent loads and car off the road for ages at a time. That's not what I want. If I'm putting unreliability into the...

Excuse my ignorance buts what's a cga engine? Is that the 1275? I havnt worked out the compression ratio yet? Do you know what 2mm skim equates to in comp ratio? Don't really want to cock up the head or have to skim it twice etc. Had various problems with this issue on my old pinto with Vulcan...

Been told to skim the head by 23 thou. Unsure what comp ratio it will be or what it is at the moment. Thecar is chip s old car from the forum. It would be nice if had a little more mid range and didn't gave to up to rev limit to make the car last. The 1.0 has same bore as 1275 just longer stroke...

Bit of an update. I've found out why my car feels so cammy to drive it's due to a large dip in the torque curve at 4k revs. I was talking to the rolling road operator and he said that the cars respond well to a head skim to up the compression ratio. He said with his experience of lots of 1000 cc...

Just worked it out with the 3.85. That would be nice gearing! Mmm. Heard of people fitting nova boxes? Cheaper for gear kits but cost of LSD cwp shafts n clutches etc expensive. I drive my car to rallies that's the only problem with having a really low diff

5.1 bit much then. What's the ratios 3.8 n 4.3 fitted too? Is a 3.8 standard 1.3 box. What sort of rev limit is safe? Mine is standard and makes max power on the limit. So maybe more power to come? Is the only way to raise the limit an aftermarket ecu?

I did email him a question earlier so maybe he will unblock me tomorrow? How much is a gearbox?

I keep getting cars for sale only on that link or am I missing something sorry