Offshoreonly.com - Preparing for SuperChargers

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Quote:

Originally Posted by blue thunder (Post 3848318)

I'm looking forward to seeing what you can get out of your panther with the blowers. What kind of top end are you getting now?

78.7 on the river was the fastest I have seen. What I want to see is if I get my power band down, and get TQ & HP closer together even with less HP if I will actually go faster. My engines made peak TQ @ 5200RPM and peak HP at 6500RPM. This might have been a better combination with a smaller lightweight efficient hull boat and not the TRS slug I have.

Jason, are you keeping those pistons? If so I'd keep the boost around 3.5-4.5 lb and good fuel. Even with a measly 3-4lbs of boost, I wouldn't be surprised to see easy 100-125hp gain over what you have . You can do more with some meth injection or race fuel. I think your cam selection will play a big factor in what you can do on the pump.

Nice choice! I wish I had the money for 2x B&M's are you going single or dual carb setup?

Quote:

Originally Posted by MILD THUNDER (Post 3848348)

Jason, are you keeping those pistons?

I plan on using my existing pistons. I called JE and talked to one of their engineers. He said the small dome pistons I have I could cut the domes off to the desired cc I wanted because they were solid dome pistons. He also told me 2.68g/cc if I cut the domes off. If they were hollow dome pistons he gave me his recommended minimum dome thicknesses dimensions N/A vs boosted.

Did you ask that because they are not flat tops or because of the compression ratio? I am going get the CR down. I don't want to run more than 5psi.

Quote:

Originally Posted by GTOKILLER (Post 3848366)

Nice choice! I wish I had the money for 2x B&M's are you going single or dual carb setup?

I actually have 6 carbs right now. 4 4150 Barry Grant Holley's and 2 1050 dominators. I have the setups for both and would like to dyno both setups.

Quote:

Originally Posted by Rookie (Post 3847475)

I started tearing down my 600HP 454's. I have 4 seasons on these engines and I run them up to 6300RPM quite regularly. I have always referred to them as my high strung 454's but all in all they have been great, mild mannered engines. They idle at 600RPM with 35* locked out timing.

This winter I am going to pull my solid roller cams and put in some blower friendly cams. As of now they are 9.6:1, with SRP small dome pistons that are 0.014" in the hole, Valako Pro1 heads, Isky Solid lifters, Crane HI-6M ignitions and Barry Grant (Holley) 750's. I have a pair of B&M 250's that I plan on putting on the top of these mills.

I plan on dynoing N/A with the new cams and then with the blower on. I will probably first run them in the boat without the blowers and then add them later in the season.

Hard to tell in the pictures, but you appear to have a couple of exhaust valves running a little leaner than the rest of them. Probably OK if they are tan instead of white, and your fuel mixture distribution will be totally different with the supercharger.

I flycut my pistons to get the static cr to 9.25 and run 6# boost. I shoot for a dynamic cr of 8.0-8.1 with my crane 731 cam straight up.

Did anyone ever make a -2 trs lower? That would help you immensley on the top end.

FWIW, I run 5300-5400rpm 1:5ratio drives w 32p bravos to get my best speeds. You might be right about lowering your power band to gain top end. I think the longer strakes will help as well since your CG is so far back with the trs setup.

Quote:

Originally Posted by Budman II (Post 3848422)

My AFR's are 11.8-12. I have bungs in all 4 tails. I was thinking that the discoloration was actually due to the little bit of reversion I have. I have over a 1 mile idle back to the dock. I had a little bit of water in the manifolds. It's hard to believe that you can pull water 3' back through dry to the tip TRS tail pipes. This should also be corrected with the new cams. Note cams on a 108* may cause reversion. lol

Quote:

Originally Posted by blue thunder (Post 3848429)

Did anyone ever make a -2 trs lower? That would help you immensley on the top end.

Not that I know of. But they do make a +1" and +2" in case you need to do some dredging at your local launch.

rookie,what is the distance from the top of the piston,not the dome,to the top of the first ringland?