Offset ground crank questions
On The Tree
Joined: Sep 2002
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From: Lafayette, LA
Re: Offset ground crank questions I would like to know this also. I am wanting to get my crank ground to a 3.71 inch stroke or TSP 3.82 inch stroke. But I am worried about how it would hold up with nitrous.
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From: Nawf Carolina
Re: Offset ground crank questions You pick up what, ~12 cubic inches I think?
You will lose some strength in the crank, although no one really knows how much. Of course, we really dont know how strong the stock crank is because I dont think anyone has broke one yet.
J.
You will lose some strength in the crank, although no one really knows how much. Of course, we really dont know how strong the stock crank is because I dont think anyone has broke one yet.
J.
Re: Offset ground crank questions Sorta unrelated but I have done this on my bigbock Buick, offset it from like 2.3 inches to 2 inches. Gained like 30 cubes and so far no probs with 2 years of racing on it, most of it on a 250 shot.
Re: Offset ground crank questions With a offset ground crank you loose rod journal to main journal overlap. That makes a weaker crank, but if they put good radii in the corners of the journals then you are going to o.k.
The stock cranks hold up a ton. I'm thinking of doing smaller rod journals on my crank but don't know if the stroke is going to increase or not. The so far have looked like a super strong piece.
If you want to do it right and start off with a new GM crank I can get you whatever you want.
Bret
The stock cranks hold up a ton. I'm thinking of doing smaller rod journals on my crank but don't know if the stroke is going to increase or not. The so far have looked like a super strong piece.
If you want to do it right and start off with a new GM crank I can get you whatever you want.
Bret
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On The Tree
Joined: Sep 2002
Posts: 156
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From: Lafayette, LA
Re: Offset ground crank questions Has anyone else have any experence with TSP offset ground cranks. Is taking the crank up to a 3.82 stroke going to weaken it too much to run nitrous. any comments good or bad please.
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Re: Offset ground crank questions Strength should be fine you are not loosing a lot of material nascar uses that size jurnals. The big issue is you have to have custom rods made and are quite pricy. For the 19 cubes you gain from stock or the 9 you would gain just offseting it to 3.72 stroke and use standard rods?
Nate
Nate
Re: Offset ground crank questions We have great pricing on the nascar rods, my c5 put down 729 rwhp on spray with that crank 
We have a couple of offset rods & cranks in stock, and I have a complete 396 rotating assembly in stock & ready to roll
Jason
Texas Speed
We have a couple of offset rods & cranks in stock, and I have a complete 396 rotating assembly in stock & ready to roll Jason
Texas Speed
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
On The Tree
Joined: Jun 2003
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From: Hatboro PA
Re: Offset ground crank questions I would like to say somthing about cranks being ground.For years the mith was a crank ground more then .010 .010 it was junk and weak. Ihave built busch grand national engines and we use honda rod size,s on them and they hold up fine. The IRL use even small size. As long as the crank has good radius it will be strong.By the way besides the Busch engines,s using honda rod size,s the cranks al so can weight any where from 30 lbs to 37 lbs.
mike
mike
Joined: Nov 2001
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From: Texas and Qatar
Re: Offset ground crank questions
Jason:
Can you tell us more about the complete rotating assembly that yields 396?
Can this be installed in a stock bored block?
Can you tell us more about the complete rotating assembly that yields 396?
Can this be installed in a stock bored block?
6.125" Carrillo Connecting Rods 7/16 rod bolts (Honda 1.88" rod journal)
Stock offset ground crank (3.822" stroke)
Crank is Magnafluxed, and entire reciprocating assembly is professionally balanced by our engine shop, who by the way builds about 400 racing engines per year.
The 396ci rotating assembly is for a 6.0L cast iron block bored .060" oversized, assuming it sonic checks thick enough to bore that far. .060" oversize = 396ci while a .030" oversize = 390ci.
If you wanted to use the stock 5.7L block with the offset crank you'd be at 366ci, while a resleeved 4.125" bore would be a 409ci engine.
Re: Offset ground crank questions
Stock offset ground crank (3.822" stroke)
That seems like a lot. How will the stability of crank hold?
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From: HOU - yeah, you know the rest.
Re: Offset ground crank questions
Stock offset ground crank (3.822" stroke)
That seems like a lot. How will the stability of crank hold?