comp ratio
01-12-2006, 07:55 PM
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cheers guys just trying to decide how low to go on my next engine aim is for 450-500bhp using gt30 bd 14s fuly ported and poilshed head 83lb siemens injectors 
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02-12-2006, 04:22 PM
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thought it would be around there euan whats it like to drive with a comp ratio like that when its off boost just trying to decide what spec to make my engine 
02-12-2006, 04:36 PM
#13
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my car drives as it did when it was standard..well apart from some part throttle issues that have yet to be resolved but these are down to the cam timing as it was smooth before the cams were twisted.
02-12-2006, 04:49 PM
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Originally Posted by glancy2081
what pistons u using cossiemanden and how many miles has ur car done on these pistons and what boost levels cheers 
Did so in my M8 car
02-12-2006, 04:59 PM
#19
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i dunno about the cossie world, but i know with other cars tuners claim to run higher comp than they really do (to impress the daft customers and to throw others off the track it seems), so i wouldnt take a lot of claims of high comp for granted either.
02-12-2006, 05:01 PM
#20
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Originally Posted by glancy2081
ok cheers euan what pistons u got in ur car and how many miles u done in this spec
thats my pistons..
02-12-2006, 05:09 PM
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you could have put the picture up with the invoice in view so a could have got the part numbers so knew exact comp ratio 
02-12-2006, 05:22 PM
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Originally Posted by rabmc
Ahh man !
I wouldnt want them all dirty ! tell me thats not in your engine lol
I wouldnt want them all dirty !
tell me thats not in your engine lol 
02-12-2006, 05:23 PM
#24
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Originally Posted by glancy2081
you could have put the picture up with the invoice in view so a could have got the part numbers so knew exact comp ratio
02-12-2006, 05:24 PM
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Originally Posted by rapidcossie
Originally Posted by glancy2081
ok cheers euan what pistons u got in ur car and how many miles u done in this spec
thats my pistons..
02-12-2006, 05:27 PM
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i didnt spec the pistons, the engine builder did..
not sure if he measured them or not?
they are custom pistons to AVA's exact spec so they must have taken ALL measurements i would have thought.
not sure if he measured them or not?
they are custom pistons to AVA's exact spec so they must have taken ALL measurements i would have thought.
02-12-2006, 05:36 PM
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These comp ratio threads are great
Looks like alot of the above have gone low, where all the high comp lads to put forward another confusing discussion
Euan i expect you had to go that low as your motor is to be held on WOT for extended periods of time yeah??
I'm going considerbaly higher than most on my build,its a 2.0 16v but not a cossie lump and the aim is just shy of 500hp.
Looks like alot of the above have gone low, where all the high comp lads to put forward another confusing discussion
Euan i expect you had to go that low as your motor is to be held on WOT for extended periods of time yeah??
I'm going considerbaly higher than most on my build,its a 2.0 16v but not a cossie lump and the aim is just shy of 500hp.
02-12-2006, 05:39 PM
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Originally Posted by rapidcossie
i didnt spec the pistons, the engine builder did..
not sure if he measured them or not?
they are custom pistons to AVA's exact spec so they must have taken ALL measurements i would have thought.
not sure if he measured them or not?
they are custom pistons to AVA's exact spec so they must have taken ALL measurements i would have thought.
We found out that if the thiknes from the valve cut out to the side wall was under 1mm, then it would ignite on the side and down the side off the piston, because the piston would glow and get hotter(hope u understand)
We had this problem on the cp-pistons on std bore
02-12-2006, 05:55 PM
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Originally Posted by Rs1
These comp ratio threads are great
Looks like alot of the above have gone low, where all the high comp lads to put forward another confusing discussion
Euan i expect you had to go that low as your motor is to be held on WOT for extended periods of time yeah??
I'm going considerbaly higher than most on my build,its a 2.0 16v but not a cossie lump and the aim is just shy of 500hp.
Looks like alot of the above have gone low, where all the high comp lads to put forward another confusing discussion
Euan i expect you had to go that low as your motor is to be held on WOT for extended periods of time yeah??
I'm going considerbaly higher than most on my build,its a 2.0 16v but not a cossie lump and the aim is just shy of 500hp.
i had the engine built to be reliable and to take alot of power..
i had no input on comp ratio at the time of build.
02-12-2006, 06:06 PM
#33
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Originally Posted by glancy2081
so can a have the je pistons out of the engine in ur front room then euan seen as you have 2 sets
yours for 600
they would have to be invisible pounds notes tho as the pistons are invisable too
02-12-2006, 06:09 PM
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8.4 :1 530 BHP , lots more responsive than the last engine which was about 6.4:1 when dismantled , very laggy and needed a good stir to bring to life . Im using Pectel T6 tho which is a lot easier to map than the Weber ecu's . this engine is mapped to do what i want from it tho , its not a shopping car with driveability !
02-12-2006, 06:15 PM
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Originally Posted by rapidcossie
Most CP pistons that AVA have seen are very thin in all areas compared to my JE's
And yes they are, but they are also lighter then JE, but that doesent make them worse
02-12-2006, 06:18 PM
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02-12-2006, 06:19 PM
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Originally Posted by cossiemanden
Originally Posted by rapidcossie
Most CP pistons that AVA have seen are very thin in all areas compared to my JE's
And yes they are, but they are also lighter then JE, but that doesent make them worse
how light are the CP pistons then?
mine are 50 grams lighter than cosworth racing ones(per piston)
02-12-2006, 06:20 PM
#39
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Originally Posted by rapidcossie
Originally Posted by cossiemanden
Originally Posted by rapidcossie
Most CP pistons that AVA have seen are very thin in all areas compared to my JE's
And yes they are, but they are also lighter then JE, but that doesent make them worse
how light are the CP pistons then?
mine are 50 grams lighter than cosworth racing ones(per piston)
This setup was 180G lighter then cosworth racing piston and std rod
This is per cylinder
02-12-2006, 06:23 PM
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Originally Posted by rapidcossie
is this ran on race fuel Tony?