bore and stroke?

[Jesh]

so first question. got a 91' galant GSX its a 4G63 block, but are there any differences between the VR4 block and the GSX? if not i could use that and build it and do a swap. second question... from what i've read you have to do some grinding on the block to make a 4G64 crank to fit. is that true? and i've also heard that there is a 100mm stroke crank and a 102mm stroke crank. um... which one do i use? i know you have to get stroker pistons. and also what do you guys think of making a stroker? i know that they lose a little bit of reliability, but i'm more interested in the power potential. any feedback would be appreciated, thanks

 

[prove_it]

Wow I can't believe no one has ever talked about this before...........

 

[belize1334]

just do a search for "stroker" and you'll learn all about the options. Also, google "dsm stroker" and there's plenty more info out there.

Some quick info to get you going.

The Galant GSX has a 4g63 just like a VR4 or DSM. The only difference is the pistons and perhaps the knock sensor. All 4g63 motors have 88mm stroke and 85mm bore (from factory). For a 6-bolt, there are two OEM cranks that fit: 88mm 4g63 and 100mm 4g64/g4cs. 102mm is not 6-bolt. If using a 100mm stroke crank you have to grind the main-caps a little so the crank clears. There are other cranks out there but they're aftermarket (for better or for worse) and they aren't cheap. Magnus makes 88mm, 92mm, and 100mm. Price tag is $1600. MAPerformance sells Eagle cranks for 88mm and 100mm. They're about $700 each. OEM 88mm and 100mm are usually cheaper but you have to find one.

 

[Jesh]

so the 4g64 100mm crank is still a six bolt? i only ask because i have a spec flywheel and would really rather not buy another flywheel.

 

[Struc]

They come in either 6-bolt or 7-bolt, just like the 4G63

 

[belize1334]

^^ Correct. If you get a 4g64 crank you'll want to make sure that it is a 6-bolt as they are available in both styles. Also, the differences extend beyond just the number of bolts. Fly-wheels aside, a 7-bolt crank WILL NOT work in a 6-bolt block.

 

[Jesh]

thanks guys, good info, exactly what i needed to know /ubbthreads/images/graemlins/smile.gif

 

[Rausch]

Quoting prove_it:
Wow I can't believe no one has ever talked about this before...........

Very helpful.

 

[Jesh]

so just curious, when you buy a stroker crank, rods and pistons as a set. is it a given that it was balanced? or does it just depend on the business?