Vern
New Member
Or maybe for you experience Cad builder/venders what is the longest rod you know or think will work? Stock strokes or otherwise? Where does it hit first?
What is the longest rod anyone has run in a Cad?
- Thread starter Vern
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MadMax
Member
Vern:
I am running a 7.25" aluminum rods out of an Arias motor - big end 2.375 x .990 width(BBChevy) - custom BRC pistons from Potter. Motor is 498 ci with a 4.32 bore x 4.25 stroke,(500 ci limit). I picked these mainly because long rods help heads with flow problems. They also created a few problems - valve pockets needed enlarged, block needed clearanced, and intake closing is more critical. Engine is on my minirod pulling tractor - no problems so far. First ran last year with CadCo dominator/Edelbrock Performer intake - now adapting a Ford 460 dominator/Victor it - need more RPM's. My :twocents:
I am running a 7.25" aluminum rods out of an Arias motor - big end 2.375 x .990 width(BBChevy) - custom BRC pistons from Potter. Motor is 498 ci with a 4.32 bore x 4.25 stroke,(500 ci limit). I picked these mainly because long rods help heads with flow problems. They also created a few problems - valve pockets needed enlarged, block needed clearanced, and intake closing is more critical. Engine is on my minirod pulling tractor - no problems so far. First ran last year with CadCo dominator/Edelbrock Performer intake - now adapting a Ford 460 dominator/Victor it - need more RPM's. My :twocents:
A
Anonymous
Guest
According to our dyno program there is a limit as to how long a rod is useful.
The number that it spit out is 7.235 and I seriously doubt anything longer than that would help reguardless of stroke.
A 6.8-7" rod would help a stock stroke 472/500 and again would work well in a stroker,either a 4.425 or 4.48/4.5 inch.
the 7+ inch long rods will help slow the pistons down a bit and a long aluminum rod would make a damn good shock absorber.
To make use of longer rods you have to have enough information (cylinder head flow thru a manifold is a good start) to properly cam this engine.
TI
Also if the piston is offset sometimes due to extended dwell and piston rock there may be piston to valve clearance issues
The number that it spit out is 7.235 and I seriously doubt anything longer than that would help reguardless of stroke.
A 6.8-7" rod would help a stock stroke 472/500 and again would work well in a stroker,either a 4.425 or 4.48/4.5 inch.
the 7+ inch long rods will help slow the pistons down a bit and a long aluminum rod would make a damn good shock absorber.
To make use of longer rods you have to have enough information (cylinder head flow thru a manifold is a good start) to properly cam this engine.
TI
Also if the piston is offset sometimes due to extended dwell and piston rock there may be piston to valve clearance issues
Vern
New Member
Thanks for the replys. MM interesting engine. Ever dyno it? What kind of rpms do you hope to be able to make peak power at this year with the new intake? Also I assume you had a custom cam made. If I may ask at least generically what kind of cam specs do you run? PS bet you get some head scratchers when they look at that motor. Are you pleased with the big Cad? PS Welcome to the board and thanks for posting.
JW Interesting info. I just sort of figured anything up to a 1.72 rod to stroke ratio would help some at least mathmatically. Which MM is knocking on the door of with a 1.705.
JW Interesting info. I just sort of figured anything up to a 1.72 rod to stroke ratio would help some at least mathmatically. Which MM is knocking on the door of with a 1.705.
POTTER
New Member
My "year before last"on my EMC engine rods were 7.6" SAENZ customs. No detonation with around 12.2 to 1 and "98" oct.