Procharged small block, boom.
12-14-2006, 08:59 AM
#82
Registered
iTrader: (8)
Re: Procharged small block, boom.
Originally Posted by bobl
This is the same cam Merc uses in the Scorpion 377, although it is fuel injected. I haven't had this boat in the water yet, but it idled pretty smooth on the dyno. Using it in a 350 will be a little more radical. I ususally use the next size smaller cam in the 350's. So much depends on the heads and desired operating RPM.
12-14-2006, 09:16 AM
#83
Registered
Join Date: Oct 2000
Location: Spicewood, Texas USA
Posts: 1,382
Likes: 0
Received 3 Likes
on
2 Posts
Re: Procharged small block, boom.
Originally Posted by unbroken
Just got mine in today, they are 208/211, but .56 lift at .050 and 1.6 ratio roller rockers. 
I will need to know what timing curve your builder wants in the ECM when you get your engines. They originally had fast burn heads that did not run a lot of timing. Since you changed heads, they probably will require more advance. It depends on the combustion chamber design.
12-14-2006, 10:08 AM
#84
Registered
Join Date: Nov 2006
Location: Austin
Posts: 89
Likes: 0
Received 0 Likes
on
0 Posts
Re: Procharged small block, boom.
Hey Bob, motors are finished tomorrow, fully dressed out. SHould be seeing you in the next couple of weeks for the dyno and ECU calibration. I think we are all going to be surprised at the power. The compression is 9:1. HMMMM that would be perfect for whipples ehhh? 
05-04-2007, 12:54 PM
#85
Registered
Thread Starter
Join Date: Oct 2004
Location: Palm City, Florida
Posts: 291
Likes: 0
Received 0 Likes
on
0 Posts
Ok, I installed the Crane 109831 cam yesterday and I'm having trouble getting it to idle. It will run if I keep the throttle slightly open, but if I bring it back to idle to quick it shuts off. I checked the idle air control valve and it is all the way open. Can I adjust the manual stop on the throttle body? Do I need to drill a hole in the throttle blade? Thanks guys.
05-04-2007, 01:06 PM
#86
Registered
iTrader: (8)
Ok, I installed the Crane 109831 cam yesterday and I'm having trouble getting it to idle. It will run if I keep the throttle slightly open, but if I bring it back to idle to quick it shuts off. I checked the idle air control valve and it is all the way open. Can I adjust the manual stop on the throttle body? Do I need to drill a hole in the throttle blade? Thanks guys.
LS1, the motor would run very rough and stumble and idle. For a quick fix I adjusted the throttle stop and it seemed to help some. I eventually drilled an 1/8th hole in the TB blade and that made a world of difference.
However, that is only a stopgap procedure until the motor was dynotuned by EFILive. After the tune the hole was no longer required and I filled it in.
05-04-2007, 07:22 PM
#88
Registered
iTrader: (3)
I'm kinda partial to the one I used in these 383's. It's a Crane 109831. I erroneously posted earlier that I had the 821 cam in these engines. If memory serves me right it's .509/.528 lift and 222/230 @ .050 duration with a 112 LSA. That's about as big as I would go. It hasn't killed my 02 sensor idling on the dyno, so I don't think it will revert water badly, although I do have Stainless Marine exhaust on it. The 109821 is a little milder and may be a better choice. I've had one of those running in a Whippled 6.2 for 3 years now. The 6 .2 came stock with the 104224 cam.
Last edited by formula 382 sr-1; 05-04-2007 at 07:25 PM.
05-07-2007, 09:27 AM
#89
Registered
Thread Starter
Join Date: Oct 2004
Location: Palm City, Florida
Posts: 291
Likes: 0
Received 0 Likes
on
0 Posts
Ok, idle problem turned out be an oops on my part. After I set the base timing I must have bumped the distributor because when I rechecked the timing it was off the scale ATC .
WHAT A DIFFERENCE A CAM MAKES! She ran just over 75 yesterday. That is a gain of 4 mph. There is still some tuning issues to deal with. Fuel mixture is 11.5:1(where I want it) at wot and 11:1 at idle(not where I want it). Looks like ASM will be getting my ECU back sometime soon. All and all I am very happy with the results. Thanks for all your help!
. WHAT A DIFFERENCE A CAM MAKES! She ran just over 75 yesterday. That is a gain of 4 mph. There is still some tuning issues to deal with. Fuel mixture is 11.5:1(where I want it) at wot and 11:1 at idle(not where I want it). Looks like ASM will be getting my ECU back sometime soon. All and all I am very happy with the results. Thanks for all your help!
