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Old 02-10-2012, 01:32 PM
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Right parts for a 350 sbc blower marine engine

I am looking for help to find out right parts and installation instructions for my marine engine.

What happened?

My engine is working in a 1989 Wellcraft Eclipse 197, 3 years in my hands. We have a lot of fun with 100 km/h speed and 5 water-skier at the same time... power without end for my little "fishing boat"

After get out of the water in October 2011 we tested the compression and pressure loss: cylinder 7 and 8 failed. We decompose the engine to grinding all cylinder. Now I want to rebuild a real motor with your help.

Here are the parts I should replace or re-use:

Engine parts:

� 350 GM Block 1995-2000 4 bolt block
� Full Roller rocker arms
� Pistons GM 940036 6106 (zero measure)
� Crankshaft (cast)
� Truck oil pan and splash plate
� Roller Camshaft CRANE 119821
� Cylinder heads SBC Victor jr. Edelbrock 77589 complete 64cc
� Carburetor 750 Mighty Demon 5402010 BM
� Edelbrock Racing air filter with K&N Application
� Weiand 144 (translation: 97% power)
� MSD starter, MSD ignition 6M-2 with Marine Rev Limiter and
Marine Distributor
� EMI Thunder -452 with stainless steel riser
� Corsa with both sides outlets (with slip in silencer)
� Monitor 2 circular cooling (water)
� Oil-cooler (from 502 bb)

The Drive is a almost new Bravo 1 1:1,5 gear ratio.

Wish is as result 400-500 hp, suitable for everyday use, not only exclusive extreme performance. Fuel is 95-98 octane.


With what parts would you rebuild the engine?

What is important to note?

What information do you still need?


Oh, a lot of questions, I know but maybe you can help me
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Old 02-22-2012, 12:41 PM
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Which camshaft for 350 CID engine with Weiand 144 supercharger?

I am looking for a roller camshaft for my marine project (21ft Wellcraft) 350 CID engine (overbore 0.030").

Important: acceptable idle, good performance, fuel min. 95 octane, CR about 8.5:1

Any ideas?

Andreas
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Old 02-22-2012, 12:56 PM
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Just do a careful blueprint job, measure everything, replace the rod bolts use arp, they are highly stressed.
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Old 02-22-2012, 01:45 PM
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here are my heads:

cylinder heads SBC Victor jr. Edelbrock 77589 complete
combustion chamber volume 64cc
intake valve 2.08"
exhaust valve 1.60"
intake runner volume 215cc
exhaust runner volume 85cc
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Old 02-22-2012, 02:50 PM
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Crane cams Hyd roller cam #119831 or #119701

www.cranecams.com
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Old 02-22-2012, 03:01 PM
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@F-BIRD'88

Do you have build engines with these cams, practical knowledge?

Andreas
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Old 02-22-2012, 03:16 PM
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Quote:
Originally Posted by andyy
@F-BIRD'88

Do you have build engines with these cams, practical knowledge?

Andreas
I have used the lfat tappet version HMV-278-2
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Old 02-22-2012, 06:42 PM
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I run an Edelbrock RPM cam lifters,push rods, RPM Heads, and roller rocker arms. Love them. 18k + miles. Purrs like a kitten at idle and pulls hard to as fast as I like. I red line at 5500 but it will go higher.
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Old 02-22-2012, 06:47 PM
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In picture 2 I assume you are showing that the skirt has been broken off the piston. I'd replace all 8 with forged pistons for the boat use. Arp rod bolts min. Consider 4340 rods if you run a lot at high speed.
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Old 02-23-2012, 11:48 AM
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Two threads, same subject, merged.
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Old 02-24-2012, 03:58 PM
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What can I expect as save idle (important for onshore boating) with these cams (without losing high rpm power):
#119821
#119831
#119701
#113821

Crane, Comp Cams, other... your recommendation?

Which cam is the best compromise?
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Old 02-24-2012, 04:32 PM
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With my combination the idle is about 950 in neutral and 750-600 in gear. I guess in a boat you would see little drop at idle. If you use a single carb there is no real need for a very hot cam. The blower will smooth out the cam roughness especially at idle. Assuming you have the dist curved correctly and the carb adjusted right.
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Old 02-24-2012, 04:44 PM
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Hi bentwings, I use only one carb (750 Mighty Demon 5402010 BM).
How "hot" should the camshaft be, which LSA?
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Old 02-24-2012, 05:16 PM
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All those crane cams will run well. The little one makes a bit less power.
The idle and low speed performance is no problem with any of these.
A low 7.5:1 compression ratio allows more blower boost and reliable power.
Get deep D dished pistons.
If using marine exhaust manifolds get the good Mercruiser Magnum manifolds or equal quality replacements. Port match to your heads exhaust ports.
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Old 02-24-2012, 10:35 PM
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Of the Crain cams F-bird suggests, For your app....boat off shore, I'd go with the first one...119821. You only have a single 750 and a small blower so there is little point in tuning for high rpm. Excess of 5000. You simply will not be able to provide enough boost to make it worthwhile. These small blowers don't make the low speed punch that a 6-71 will even OD'ing them higher.

A boat starts off with a big load at load at 2500-3000 rpm so you really need the power here. Your boat is no flyweight and not really designed for 100 mph speeds. Pulling 5 skiers is a heck of a load so I'd prop for 5000+ at 70 mph I'd tune for max of 5000 to 5500 WOT no skiers. your motor is gasping at this speed.

F-Bird suggests using very low comp pistons...I agree. You will be running on marina gas which is probably 87 on a good day so essentially as I do run on reg gas. Everything needs to be right however and just because you have low comp does not mean burned pistons are a thing of the past. If you go lean under full power you better have a good paddle.

The heads will be fine...I wish I had them. the 64 cc chamber makes a deep dish piston mandatory. I think there is only one -22 cc piston available unless you go with forged ones.
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