Retarding cam - help reversion?
11-07-2017, 07:34 PM
#11
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His ,050" cam timing says Intake Opens at 11*BTDC and Exhaust Closes at 15*ATDC
Last edited by SB; 11-07-2017 at 07:38 PM.
11-08-2017, 08:50 AM
#13
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Thread Starter
11-08-2017, 08:57 AM
#14
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With dry pipes he might get 5700 without a big torque drop with a cam that won't stall at the dock etc.
It will be close.
With wet ones he needs to cut back on the overlap and keep in mind they won't flow enough to see 5700 with his cubic inches without a large torque drop off.
He needs to either go dry or change the cam to one with way less overlap and duration and prop it to match a 5000-5400 limit.
How do I know this I've talked to several cam companys and ran many dyno programs to get some ideas for my 550 inch build.
Now I know they are not perfect but give you a good idea of where the torque drops.
It will be close.
With wet ones he needs to cut back on the overlap and keep in mind they won't flow enough to see 5700 with his cubic inches without a large torque drop off.
He needs to either go dry or change the cam to one with way less overlap and duration and prop it to match a 5000-5400 limit.
How do I know this I've talked to several cam companys and ran many dyno programs to get some ideas for my 550 inch build.
Now I know they are not perfect but give you a good idea of where the torque drops.
11-08-2017, 09:18 AM
#15
Registered
Thread Starter
With dry pipes he might get 5700 without a big torque drop with a cam that won't stall at the dock etc.
It will be close.
With wet ones he needs to cut back on the overlap and keep in mind they won't flow enough to see 5700 with his cubic inches without a large torque drop off.
He needs to either go dry or change the cam to one with way less overlap and duration and prop it to match a 5000-5400 limit.
How do I know this I've talked to several cam companys and ran many dyno programs to get some ideas for my 550 inch build.
Now I know they are not perfect but give you a good idea of where the torque drops.
It will be close.
With wet ones he needs to cut back on the overlap and keep in mind they won't flow enough to see 5700 with his cubic inches without a large torque drop off.
He needs to either go dry or change the cam to one with way less overlap and duration and prop it to match a 5000-5400 limit.
How do I know this I've talked to several cam companys and ran many dyno programs to get some ideas for my 550 inch build.
Now I know they are not perfect but give you a good idea of where the torque drops.
11-08-2017, 12:07 PM
#17
Platinum Member
In my opnion with no experience on this (shifting cam around trying to fend off reversion), I would think advancing that cam would be less like to revert.
Reason is overlap after TDC (when piston going down and exhaust valve still open) is when reversion happens...right ? So, retarding cam would put more overlap ATDC.
Again, my thoughts....speaking of which, I would think that cam, no matter where you have it installed, will revert with those exhausts.
Reason is overlap after TDC (when piston going down and exhaust valve still open) is when reversion happens...right ? So, retarding cam would put more overlap ATDC.
Again, my thoughts....speaking of which, I would think that cam, no matter where you have it installed, will revert with those exhausts.
11-08-2017, 01:58 PM
#18
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iTrader: (7)
Maybe put a call into SLR Cams. You made good power especially with stock heads. You could always exceed your goals by installing crane 651 cam and a 871 blower. There was a great deal on some a while back in the swap shop. Should put you in the mid 70's. Now that sounds like fun. Btw for a single I'd say your pushing that boat pretty well for a 30 footer.
11-08-2017, 02:41 PM
#19
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Thread Starter
Maybe put a call into SLR Cams. You made good power especially with stock heads. You could always exceed your goals by installing crane 651 cam and a 871 blower. There was a great deal on some a while back in the swap shop. Should put you in the mid 70's. Now that sounds like fun. Btw for a single I'd say your pushing that boat pretty well for a 30 footer.
11-08-2017, 03:02 PM
#20
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iTrader: (7)
Been around for many years but stil a great cam and I bet would work well with your current build / heads. I'm not sure what your plan is to do but thought I'd post the cam card anyway.
Last edited by getrdunn; 11-08-2017 at 03:08 PM.
