Does anyone stroke diesels like gassers?

madmikeismad

madmikeismad

So mad
Joined
Dec 19, 2009
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Just curious. I know it's common with gassers, but never really hear about it with diesels.
 
It can be done. Duramax guys like to do it but it's $$ I believe cummins guys stay away from it due to to much stroke and you will hit the cam, At least that's what I have heard. Ford guys well there just slow LOL but more or less the cost turns most diesel guys away.
 
How excessive is the cost? twice as much as a gasser? What makes it more expensive, the heavier parts?
 
Less people do it. You can practically go and buy a 383 stoker kit at Walmart. But these things it's not as common supply and demand and what not.
 
Destroked.com has stroker cranks listed on their site. I asked a lil about them when I last called up there. I remember the price was insane, I wanna say it was like $5K+ for just the crank
 
More common in naturally aspirated stuff, diesel or gas. Not so necessary when you can cram 40-300psi of air into the motor. Also, as stated above it is very cost prohibitive.
 
madmikeismad said:
Just curious. I know it's common with gassers, but never really hear about it with diesels.
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Yes. A 6.6l Dura moves to a 7.1 stroker. A 6.7 Cummins become a 7.3l. And a 5.9 Cummins moves to a 6.6l at a total cost of around 15k for the rods, pistons, and crank.

There are some other options. Like an offset grind on the crank to increase displacement. A little bit of extra displacement can really help spool a big charger.
 
a little birdie told me the 6.7 is just bigger bore..... i need to search that
 
StainlessRRA said:
There are some other options. Like an offset grind on the crank to increase displacement.
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Tractor guys have been doing that for years in the classes where a billet crank isn't really needed. Also, by itself, offset grinding the crank isn't nearly as expensive as going and buying the destroked crank. However, you still have to figure out how to handle the extra stroke. There aren't a heck of a lot of guys doing this, and the ones that are, aren't talking (as to be expected).
 
j-rod said:
Tractor guys have been doing that for years in the classes where a billet crank isn't really needed. Also, by itself, offset grinding the crank isn't nearly as expensive as going and buying the destroked crank. However, you still have to figure out how to handle the extra stroke. There aren't a heck of a lot of guys doing this, and the ones that are, aren't talking (as to be expected).
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It's actually VERY reasonable. Especially if you have access to a machine shop. I'm supprised it isn't very common. But I guess people never think of it. Or realize you can do it.
 
Welding up a crank, machining and truing a tractor is not cheap. Plus, if you are going to run a lot of rpms, the welded crank will not last long. A billet stroker crank for a pulling tractor will cost $10,000.
 
First you need to ensure a bigger stroke is going to help in your application. A few setups have been tried and tested on the engine dyno. Not all applications benefit from having a bigger stroke.

IIRC, a 6.7 crank has 0.160" more stroke than a 5.9. You can't just use a 5.9 rod and piston with a 6.7 crank. Your piston would stick out of the block a wee bit too much.
 
who in the hell pays 10k for a stroker crank or 7k last time ichecked with a local shop the total price was just under 4k billet crank
 
jedeka said:
Welding up a crank, machining and truing a tractor is not cheap. Plus, if you are going to run a lot of rpms, the welded crank will not last long. A billet stroker crank for a pulling tractor will cost $10,000.
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Cheap is relative. Welding, offset grinding, balancing, and counter-weighting is a little more than half the cost of destroked's crank.

"Lot of rpms" is also relative... Plenty of the SF tractors are turning 5k+ without issue on a welded crank at 640 cubes. I think my buddy had close to 90 hooks on his SF crank, and he only replaced it for the peace of mind.
 
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