High Comp CG13DE

[Luca bonazzi]

Okay, so I got a spare CG13 engine in the garage, ran like a dream before I took it out so I may swell make use of it!

Was Planning on a low budget project, so I thought why not make it high compression!

Iv looked around for thinner gaskets and iv found some at 0.5mm thick, for about £200 in japan!
this is way over my budget, but the 0.7 mm reduction in the gasket thickness over the standard gasket raises the compression ratio from 9.5 to 10.3

so if i was to skim the head by 1mm then I should be getting a CR of about 10.45, got this from a calculator and data from another thread on here (can't remember where!)
this with standard gasket

with a 0.2mm gasket (would this be the same as a standard gasket with 1mm head skim?)

Also roughly how high of a compression ratio you think I can go before it will start pinging using regular petrol and V-power?

thanks!

 

[Luca bonazzi]

It was off frank i got those details!

there,s a CR calculator here kipsy http://www.race-cars.net/calculators/compression_calculator.html
fill these in
71
80.5
4
25
-8
1.2
and to double check a CG 1.0 engine
71
63
4
25
0
1.2

frank, Jul 19, 2011

 

[frank]

you can go to 11 or 12:1 no probs luca, i ran 1.0 pistons on unleaded for ages (stock ecu)

 

[Luca bonazzi]

Would you need to retard the spark at all? And did you run regular unleaded?

 

[frank]

Would you need to retard the spark at all? And did you run regular unleaded?

i did,nt have timing gun at the time tbh mate, so cant say for sure, and yes regular u/l

 

[Luca bonazzi]

Awesome, any noticeable improvement to make it worth while?

 

[frank]

Awesome, any noticeable improvement to make it worth while?

you get more grunt and better mpg with raised compression , and they are a must if you fit some wilder cams

 

[l_jonez]

High comp is a simple yet cost effective route to go down

 

[Luca bonazzi]

Awesome, will see how my funds are doing in a few weeks and this may be a go!

 

[pork]

Just gunna revive this to save on new thread.

Search is useless on this app!

What skim can I do with cg10 Pistons in a cg13

Any other n/a mods worth doing?

I have a starlet inlet mani, what's best size t/b to use

......which injectors?

 

[jamier2007]

I had a 1mm skim with my 1.0l piston'd 1.3, I know frank had even more skimmed but he runs LPG which is a tad safer.

 

[frank]

I had a 1mm skim with my 1.0l piston'd 1.3, I know frank had even more skimmed but he USED TO RUN LPG which is a tad safer.

wish i still was, 52p/L in brum atm !

 

[jamier2007]

Whaaaaat. How come you changed?

 

[frank]

Whaaaaat. How come you changed?

the kit was on my blue k11 jamie (which was stolen) and i would need the more sophisticated wet/injected system to run lpg+t