Reading through other threads I have come up with a few ideas. I know i am going to purchase another gti-6 engine and slowly work on that because this could be a long and fairly expensive project.

I am interested in going down the stroked route - probably 88mm crank but i've seen somebody mention 91mm - from the new diesel engines - would this drop straight in? What are peoples opinions on this? Do you think the lower rev limit and BHP would have a negative effect on the drivability for a track / sprint car? I do like torque though! but wouldnt want it to drive like a diesel!

I would probably bore it out to 88mm too. How easy is it get different sized con rods / pistons to suit the new crank and bore dims?

If you increase stroke length do you tend to reduce con rod length or the "height" of the pistons? On these blocks, if you go with a larger crank is there chance of the bottom of the piston dropping below the base of the block?

Lastly, if you made a quality n/a engine maybe making 230 bhp and then supercharged it - would the overall effect be much better than a standard s/c engine? I know the obvious answer would be yes but it doesnt always work like that does it?!?!

Cheers. Dan

Right i've decided to just get on with this build - i've just read drSartys thread on the 205 forum and he's done pretty much what i want to do.

I've sourced a 92mm crank as i might aswell go for that rather than 88mm if they both fit.

With regards to my comments on lower bhp / rev limit - i thought with a longer stroke the increased piston speed meant engne speed had to be reduced? and that this would negatively affect bhp - but im not too worried about that looking at other similar engine build threads.

DrSarty could only bore out to 87mm as the space between cylinders was very small - his was a different block though i believe - will this be the same on the 6 block? or can i get away with 88? If it comes to it i'd favour the extra reliability.



With this i presume i'll buy some new pistons and have the gudgeon pin height set to accomodate the greater stroke length - will the big end of con rods fit direct onto the crank shaft?

Will also be fitting lairy cams so will have the piston crown machined to suit. I would have thought thi would have a massive effect on CR though considering taking 1/10's of a mm off the head has a big effect on CR. Also i will probably want to increase CR so i really need to know about this!

BTW i presume that the CR will already be increased considering the displacement is being increased but it will still be compressing into same volume?

I plan to get most of the parts first but is anyone selling a cheap 6 engine?!?!

I plan to use QEP but they are bit far away from Yorkshire - is there anyone as good based up North?

just deciding over 88mm or 92mm now. I need to try find out info on the different engines - does anyone know any good website thats have detailed specs of the different engines? I was thinking, if the blocks are similar would the 2.1D conrods be worth getting along with the crank - that way the rods fit the crank. could then get pistons made to suit???

Lairy was the wrong word for the cams - maybe just a little more than what you'd get away with on a standard engine (with no profile cut into pistons).

What do you mean by unsheild the valves? I plan to get the valve seats triple angle cut but that was about it.

I dont wanna go 88mm crank if i'll always regret not going 92mm but i don't want to make it too difficult / expensive either. Can anyone convince me why 92mm is the way forward?!?!?!

Cheers

Havnt a clue about block height or rod sizes/lengths to be honest.

I meant un-shielding the valves as in opening up the area directly around the edge of the valve in the combustion chamber, with the extra bore you can afford to do this.

I wont regret not going 92mm because i have a cheap way of doing mine. All i think is that the extra money and effort to go to 92mm would be better spent on bodies, or cams, or set up etc.

Here is a quote i found from some site when talking about using a 92mm crank 'I wouldn

for the management, look for a mapper that isn't a million miles from you and ask what they Prefer.

Emerald, DTA, OMEX etc will all do the job.

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Bring on the Trumpets.

Its a BTCC engine, AFAIK they were limited to standard valves and standard lift, though very long duration, basically Group N factory blueprinted +


they are very big valves as standard anyway, so its quite pointless going any larger in the standard 86mm bore, you'd possibly cause more of a restriction than anything.

________________________________________

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Bring on the Trumpets.

Indeed

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Bring on the Trumpets.

but if you rework the head and re-cut the valve seats you would have to re-profile and match up the valves anyway, so they would not be "standard" any-more anyway

http://www.cylinderheadshop.co.uk/services.html

doesnt quite back your argument up

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quite possibly yes, TA!

and actually, the 306 maxi kitcar I know of has 180 lbft, so

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Bring on the Trumpets.

It may do at *peak torque* but its peak figure is not going to be at 9k is it? Anyhow i'm off.