PDA

View Full Version : Cam, water reversion question



Jim W
07-25-2007, 05:06 AM
Pretty sure when I decided on this cam I was NOT going to use wet headers. The guy I am selling the boat to asked it water could be run. I dont know so, I am asking you guys...
BBC 396 with Bassett headers.
Comp Cams pn # 11-236-4
Hyd cam with 112 separation
Can he run water???
Be good, Jim

DetroitJim
07-25-2007, 06:08 AM
Any hydraulic cam with 112 LSA you should be fine. Any cam can run with water as long as it does not come on until around 2000 rpm. Keep the amount of water to a minimum regardless. Dump some overboard if necessary to keep the block pressure down.

cfm
07-25-2007, 07:38 AM
Part Number 11-236-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB XM 270H-12
Description
--------------------------------------------------------------------------------
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.544 0.547
Duration At 0.006 Tappet Lift 270 286
--------------------------------------------------------------------------------
Valve Timing At 0.006
Open Close
Intake 25 65
Exhaust 77 29
--------------------------------------------------------------------------------
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 226 236
Lobe Lift 0.32 0.322
Lobe Separation 112

cfm
07-25-2007, 07:43 AM
I'm not involved with jet boats and water injected headers so I can not comment on the answer. I posted cam info above so those with experience with these can help answer.
I can comment that LSA by itself has absolutely nothing to do with reversion. Please do not go by this # as a stand a lone for reversion questions/answers.
Valve overlap, cid, compression, cyl head attributes, exhaust type/ dimensions/routing/where water mixes, intake manifold, and etc all effect exhaust reversion.

ghittner
07-25-2007, 07:50 AM
It should be no problem.

Jim W
07-25-2007, 01:21 PM
Thanks guys. I was pretty sure it was ok but wanted to check with the ex-spurts...LOL
Be good, Jim

SmokinLowriderSS
07-25-2007, 02:51 PM
IMO the reversion risk is from long exhaust duration, and the 280+ degrees should be plenty tame to minimize the risks, as long as either jacketed exhaust is used, or injecteds are dry below 2-grand or so.