SR crankshafts of choice?

[Maurder]

Well, I located a front clip yesterday and decided to trade it because its here in town "rare" were I live. Heres the catch. Some idiot :smash: decided to put a T66 on it and cracked the crank shaft when it tossed a piston. Its a stock motor for the most part wich was a dumb idea in the first place. It has a brand new FMIC, Z32MAF, new ignitor chip and new fuel injectors I think there 700+cc. I guess he was going to rebuild it and put it in his S14. I decided to just trade ONLY my rb25 pieces for the entire clip. At my shop I have an extra SR block from my old project wich I was going to build but sold the car first. I have all the extra parts and will be putting better internals in anyways. So for just my RB block heads,internals I got an entire clip wich was abused but is easly salvaged so I can put it in my car, the guy was just stright up idiot and moded the damn motor when it was still in the clip before he even pulled the motor to rebuild it. But the T66 is used and I can probably just send it away and have it rebuildt for a good price and use the top moun tsetup it has on it.



So can anyone out of experience wich rebuilding SR motors for good HP/TRQ curves and numbers be able to give me a good crank shaft of choice on a personal level and not one that was read out of a documentry or fourm.

I will do follow ups on this project as well and my last SR was stock running on a T28 so im ready for some power now sence I dont have to use it as a DD.

and if anyone has some good information on maybe internals to go with and sleeves and maybe a 1.5mm HG ect throw down. Thanks! :eek3d:

[DoriftoSlut]

All SR cranks are the same. I've had my checked to see if it needed to be balanced when i rebuilt my motor. It was off like 7 or 8 lbs at full revs. By comparison, a stock Chevy V8 crank it off a couple HUNDRED pounds!


SR Cranks are wicked balanced, just get the one you have and throw it in that motor when you rebuild it.

[Maurder]

so the stock SR crank is the same as the ones that go in the 2.2 stroker kits ect? just balanced different. would make sence I know the SR cranks are pretty strong if they have the right hardware attached. Thanks.

[DoriftoSlut]

Whoa, you have a 2.2 stoker motor? You didn't say that in the first post.


It depends on the kit, but most stroker motors are a new crank. If you have a 2.2L you need to find out what company stroker kit you have, go to them, and get the replacement crank. Hahaha. that's gonna be FUUUUUN!!!!!! Good luck.

[redsuns3838]

i think dorifutoslut meant that SR cranks from S13 and S14, and S15? are the same, stock crankshafts.

i think maurder was just asking as an example if 2.2 stroker kits had the same crank, just for the heck of asking..i dont *think* he has one. and no, the crank is different on 2.2L kits

could be wrong about both people but it seems like everyones confused.

[DoriftoSlut]

Yeah, S13/4/5 cranks ar ethe same. Or at least... INTERCHANGEABLE with no pros or cons to any of them. Whether they are the same part number... i am not 110%.


Stroker kits are new crank. Thus the high price.

[crazyikimasho]

They are also the same as Sentra w/SR20de

[Maurder]

ah makes more sence now. I might just do a custom grind on the crank down at the shop depending on what I want for over all performance I guess. My 270's came in today as well, along with my R32 brake set. :werd:

[wootwoot]

In the last made FWD variation of the sr20de it came with a much lighter crank that is suppose to be several pounds lighter. It requires use of a harmonic dampener though. Check it out.

[fliprayzin240sx]

Strokers kits (Tomei/Toda/HKS) all makes kits with new rods, pistons and cranks. Ive never heard of anybody milling the stock crank to make more displacement...dont think its a good idea either.

[wootwoot]

^^^^ some crazy crank shop guys will weld additional material onto the journals then polish them/shape them to how they need to be. Its sketchy and hard as fuck. I have at most heard of guys getting an extra 2.0mm of stroke from this as well. I think it is more beneficial to the rod ratio or something. I dont know wtf I'm talking about.

[Maurder]

I was looking into the HKS crank. My family owns an engine shop so I know all about milling the crank. I won't touch the crank sence an SR is a strong motor in the first place. I will go with a regular stroker kit and do a 3 angle on the head. I put my cam's in this morning along with new seats,springs, ect. So the head is complete I just need to build the bottom end. I am hoping for around 500 to the wheels maybe more off this T66. The shaft in the T66 is bad so I sent that away to go get a new shaft and to check the impeller and put new seals in it. Hopefually I will get that back within the next couple weeks. Then all I need to do is drop the motor in the car. This week will be bottom end week and I get parts from So,Cali 2 day so no problem on meeting that dead line.

[blu808]

A stock crank is all you need, unless you are going to buy a stroker setup which will come with new pistons and rods.

Just take a stock crank, polish the journals, have it balanced with the whole rotating assembly, then have it cryo treated if you are really that concerned.


I actually have 2 perfect cranks sitting here if you need one.

[McRussellPants]

^^^^ some crazy crank shop guys will weld additional material onto the journals then polish them/shape them to how they need to be. Its sketchy and hard as fuck. I have at most heard of guys getting an extra 2.0mm of stroke from this as well. I think it is more beneficial to the rod ratio or something. I dont know wtf I'm talking about.

Stroking a motor is bad for rod ratio.

longer rods are good for rod ratio.

Hence why OS RB30s have a much higher deck height.

Hence why the Riverside car needs a hole in its hood.