Can a 409 crank be offset ground to Z11 specs.
Z11 crank
- Thread starter Barry Taylor
- Start date
No
You just want a longer stroke. Trying to "offset" like that would create tiny rod ends if you could pull it off. You would then need to create these new tiny rods too. When all you need is a longer stroke to accomplish the desired effect.
You just want a longer stroke. Trying to "offset" like that would create tiny rod ends if you could pull it off. You would then need to create these new tiny rods too. When all you need is a longer stroke to accomplish the desired effect.
Not sure what the math would work out to, 2.10 small block end would get some, some of those big money engines have Honda rod size.
We used to weld up and offset grind 400 and 350 cranks for round track.
Guess i need to get this crank out and take a closer look at it. Thanks guys!!
The real benefit to me would be less mass out so far would help that baby spin quicker. I forgot about the Honda rods, may be something there too. Measure 3 times cut once.
Smaller the bearing diameter, slower the bearing speed.
Please let me know how it turns out Barry. Is this from the engine going to the red car?
I have/had one.
First pic is the stroker which I still have, the other pics are what I believe to be a Z-11 but I no longer have it. It got scrapped.
How about a Z-11? crank?
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This was a crank that was in a motor that i acquired from a friend Clinton Murphy who raced the Black Armortech 62 Btop back in the day. Ronnie and i raced this motor for a short period.
3.840 is the most stroke you can get out of the crank with the 2.10 rod journal with a 396/427 crank.
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409envy
Well Known Member
For the money you would spend regrinding a 50+ year old crank you would be better served calling one of the custom crank manufacturers and having a Z11 spec crank made for you. It might cost a little more but would be a much higher quality product not to mention more durable. Just my 2 cents.
I guess i should have been a little more informative in the begining. I either have a welded up and reground crank or a Z11 crank. I just need to get out and look at it. Right now I’m in the middle of freshening the race motor.
Without the rest of the motor its supposed to go in? Would make a nice coffee table for a conversation piece. Isn't one of the NASCAR Z11 single 4 barrel intakes a coffee table? I have a picture somewhere.
If I had a z11 crank I would throw it in one of my 814 blocks then buy new pistons and rods making myself a z11 bottom end!
I knew I had seen it somewhere! Good Z11 conversation piece.
Ain’t that purty!!!!!!
Greg Reimer
Well Known Member
A great way to build a Z-11 sized engine that wouldn't mind higher RPM's would be to get the 3.650" stroke crank, use a big block aftermarket 6.35" rod, then get the lightest pistons made that you could find for the bore, stroke,and custom rod length. That would drastically reduce the weight of the pistons, give you better stronger rods, more stroke than the OEM 409 had, a better rod length to stroke ratio due to better rod angularity, and due to the lighter rotating mass, would do better at higher RPM's. That rather rusty crank in the photos had aftermarket cheek plates welded to the inside of the counterweights, which makes it almost impossible to turn the rod journals without removing the cheek plates. If you had to add weight to something to offset an imbalance on the end of the piston and rod, then they were already way too heavy to start with.