Hks 2.8 Stroker Bore

[Lived4eva]

Hey all,

Just wanted to get some feedback on which would be a better path. I have a HKS 2.8 stroker crank and was worried that the recommended 87mm bore might be pushing it with the 05u block. I know 87mm is pretty safe but I am not going to push ridiculous numbers, around 300kw or so was more building for response some more torque and reliability. To that end maybe going with a 86.5mm bore would be more suited for my application? With the 86.5 bore capacity is 2.73 or close to, with the 87mm its 2.78. If I was going with an N1 block I am sure 87mm would be fine but last thing I want is to strengthen internals only to weaken the block.

Thanks

[skylinekid]

personally mate for 300kw a stroker kit is a waste of time... just use the std crank chuck in a set or rod and pistons or even stay with stock rods for that matter. and abit of head work if ur keen. should be able to even make that on a std head i would have thought

[N1GTR]

You're right skylinekid, you can make heaps more than 300kw atw with a stock head.

Agreed, dont waste money on a stroker if you're only going for 300kw atw

[Lived4eva]

Thank for the input.

I am going to be running Nismo 581 turbos (group a's) and wanted a bit more capacity for response. Another reason is that I got the crank at a good price and thought it would be better to go with a stroker crank rather then an R33 crank that way I get a bit more capacity and the wider collar. Plus as an added bonus the counter crank should be less likely to cause the oil pump distress. I realise you are right that 300kw can be achived without replacing the crank but it was always going to have to come out of the car to get a collar so why not throw something better in? I was always going to put forged rods and pistons in, now I just have to get some customs pistons made to suit the crank as I don't have the full HKS stroker kit.

Getting off the point here. Was more interested in how well the 05U block would handle a bore of 87mm as opposed to 86.5. I couldn't find anything from HKS about whether their stroker kits where recommended to be run on an N1 block.

[N1GTR]

There are countless people with 05U blocks running 87mm with no issues. Also some out there at 87.5 - dont worry, stock everything will be fine at 300kw

[Lived4eva]

Cheers

[Super_Dude]

The block should be fine at 300kw regardless of bore but it is up to you whether or not you feel 50cc's is worth the small risk. Only early r32 cranks had the narrow collar issue. It was fixed in the later (92+) r32's and all the 33 and 34's are OK. IMO if you got a cheap 2.8 stroker crank why not? Your gonna get power hungry anyway and go for more down the line anyway.

Edited February 16, 2009 by Super_Dude

[Lived4eva]

^^^ You are thinking much the same as I am. I would rather over build the engine while its apart and have room to push it further if I want to down the track. I hate doing things twice.

[N1GTR]

While i agree with that logic, at what point do you say "nope, thats enough"

[Smoky]

While i agree with that logic, at what point do you say "nope, thats enough"

Right about............................................................... now!!

[Piggaz]

The 05U block that was in my car when the Tomei stroker went in cracked between 3 and 4. I wouldnt trust it to be honest.