help!
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hi, im helping a mate rebuild a cvh hes just bought.iv just stripped it and found the block face to be in a bit of a bad way!!!it seems to be fairly worn between the bores.i was thinking of getting it skimmed but it looks like its been skimmed a few times already!so does anyone know of a good multi-layer gasket he could use or how i could measure the block??or any other ideas??
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forgot to mention the head face isnt great but has also had the hell skimmed out it!!but should be ok with abit of wet+dry!!!would low comp pistons be a way to go or hes thinking of buying a used engine off ebay but im not sure thats guna b any better!!
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local engineer has got the head and says its pretty f***ed!hes done quite abit with cvhs and says its one of the worst hes seen![Wall](https://passionford.com/forum/images/smilies/wall.gif)
im just cleanning up the block when i noticed its state!dont really wana go low comp due to lag and cost!its only going to be a standard re-build.
was wondeing would a decompression plate be an idea?i havnt much experiance with cvhs so any ideas welcome
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im just cleanning up the block when i noticed its state!dont really wana go low comp due to lag and cost!its only going to be a standard re-build.
was wondeing would a decompression plate be an idea?i havnt much experiance with cvhs so any ideas welcome
#6
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as above, you only run low comp when you've reached maximum power for a set engine potential, i've run over 200bhp on standard internals, as reliable as any other engine i've run too.
low comp is more laggy as said, plus uses more fuel also, basically needs loads more boost to get the best from them.
find a good known complete engine and fit it, you can spend a lot to sort a bottom end plus gaskets etc. just get a working engine for around Ł400 ready to roll.
low comp is more laggy as said, plus uses more fuel also, basically needs loads more boost to get the best from them.
find a good known complete engine and fit it, you can spend a lot to sort a bottom end plus gaskets etc. just get a working engine for around Ł400 ready to roll.
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iv sorted all gaskets ,bearings and most other internals i just need to find a good block and head to put all the bits in!!!altho if the block is none in then maybe its a sign for zvh!!!!!!!!!!!!!
#10
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#12
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as above, you only run low comp when you've reached maximum power for a set engine potential, i've run over 200bhp on standard internals, as reliable as any other engine i've run too.
low comp is more laggy as said, plus uses more fuel also, basically needs loads more boost to get the best from them.
find a good known complete engine and fit it, you can spend a lot to sort a bottom end plus gaskets etc. just get a working engine for around Ł400 ready to roll.
low comp is more laggy as said, plus uses more fuel also, basically needs loads more boost to get the best from them.
find a good known complete engine and fit it, you can spend a lot to sort a bottom end plus gaskets etc. just get a working engine for around Ł400 ready to roll.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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#14
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Do we really need to have an argument about going low comp making an engine drive less responsive off boost?? ![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
If you lower the compression of an engine from standard it will make less power/torque off boost than it did before, IMO this is not debatable! Even more so on a MFI RST where you cannot compensate for it a little with good mapping.
It's only done to allow bigger boost pressure to be run if your chasing big bhp figures, otherwise it's best to maintain as higher CR as possible....IMO!
![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
If you lower the compression of an engine from standard it will make less power/torque off boost than it did before, IMO this is not debatable! Even more so on a MFI RST where you cannot compensate for it a little with good mapping.
It's only done to allow bigger boost pressure to be run if your chasing big bhp figures, otherwise it's best to maintain as higher CR as possible....IMO!
![](https://passionford.com/forum/images/smilies/roi.gif)
Last edited by Karlos G; 11-08-2009 at 07:26 AM.
#16
focus rs 1672
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Do we really need to have an argument about going low comp making an engine drive less responsive off boost?? ![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
If you lower the compression of an engine from standard it will make less power/torque off boost than it did before, IMO this is not debatable! Even more so on a MFI RST where you cannot compensate for it a little with good mapping.
It's only done to allow bigger boost pressure to be run if your chasing big bhp figures, otherwise it's best to maintain as higher CR as possible....IMO!![](https://passionford.com/forum/images/smilies/roi.gif)
![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
If you lower the compression of an engine from standard it will make less power/torque off boost than it did before, IMO this is not debatable! Even more so on a MFI RST where you cannot compensate for it a little with good mapping.
It's only done to allow bigger boost pressure to be run if your chasing big bhp figures, otherwise it's best to maintain as higher CR as possible....IMO!
![](https://passionford.com/forum/images/smilies/roi.gif)
#17
Balls Deep!
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It's not BS, as I said above if you lower the compression of an engine from standard it will make less power/torque off boost than it did before.
The actual time it takes to spool up as you say will depend on the overall spec of the engine and turbo etc.. but if you drop the CR making the engine less responsive, dropping gas velocity, taking longer to reach the RPM at which the turbo makes peek boost (or even start to spool for that matter) it will make it laggier!
All i'm trying to point out to the guy is that it will feel slower, less responsive, laggier, off boost if he drops the CR and is not needed unless he's going for really big BHP.
Do you not agree?
The actual time it takes to spool up as you say will depend on the overall spec of the engine and turbo etc.. but if you drop the CR making the engine less responsive, dropping gas velocity, taking longer to reach the RPM at which the turbo makes peek boost (or even start to spool for that matter) it will make it laggier!
All i'm trying to point out to the guy is that it will feel slower, less responsive, laggier, off boost if he drops the CR and is not needed unless he's going for really big BHP.
Do you not agree?
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the thing is iv got all the things for a re-build but i have no block or head to build the bits to!!!
#20
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i know that if i lower the cp it wil make it lag more as said above.its not a big power build. but the thought behind low comp pistons was then i could skim the head and block so would even out the cp!but the head wont take anymore skimming so i cant do that!!
#24
focus rs 1672
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It's not BS, as I said above if you lower the compression of an engine from standard it will make less power/torque off boost than it did before.
The actual time it takes to spool up as you say will depend on the overall spec of the engine and turbo etc.. but if you drop the CR making the engine less responsive, dropping gas velocity, taking longer to reach the RPM at which the turbo makes peek boost (or even start to spool for that matter) it will make it laggier!
All i'm trying to point out to the guy is that it will feel slower, less responsive, laggier, off boost if he drops the CR and is not needed unless he's going for really big BHP.
Do you not agree?
The actual time it takes to spool up as you say will depend on the overall spec of the engine and turbo etc.. but if you drop the CR making the engine less responsive, dropping gas velocity, taking longer to reach the RPM at which the turbo makes peek boost (or even start to spool for that matter) it will make it laggier!
All i'm trying to point out to the guy is that it will feel slower, less responsive, laggier, off boost if he drops the CR and is not needed unless he's going for really big BHP.
Do you not agree?
anyway am out,until u go away and test a std engine,low comp it then compare the differences then am not going to comment again