Thread:

Need more power!

Assuming you want to stay with pump gas (sounds like you're @ 10:1+) Solid roller, good valve train and a Dart or Edelbrock Vic. and a 1050. What's your exhaust?

Originally Posted by Need4Speed77

I am looking for any ways to bump up the power in my 509. It is a merlin II with merlin heads (iron 320cc). It has a 5140 kellogg crank and 200cc tall dome srp pistons. I have a victor jr 454-r intake and a pos 850 marine carb. I know that if I bump up to a diff carb and get rid of the water in the headers I can pick up some. I am turning my alum b/c impeller to 5600 rpms and I want to turn it to 6300-6500. Short of swapping pistons and heads what can be done to reach that goal?? Any help would be appreciated.

That works out to what? 100+ to 1 CR. Pump is out of the question May diesel

Originally Posted by Need4Speed77

I am already running av gas not the crap from the pumps around here. I already has a solid roller cam, clay smith c-318. O/T bassetts. I don't want to go any higher on the compression but I may have to to get what I want out of this motor. I am not exactly sure but I should be able to get at least 600 out of it without that much work, Right? I am around 400hp as it sits. My 468 had about 550hp, I don't get it, less ci more hp??? WTF??? I wish I had my old 468 in this boat!!!

You have a completely mis matched combination of parts, it sounds like. You need to decide what your goal is and reverse design the engine from where it is. Your combination as is should make plenty of power, so I'm guessing right off the bat you have the wrong cam. Might make sure of things like timing and that the carb's opening all the way, but I would think you've done that by now.

Dyno time. With a few pulls you can pick up significant hp.

Originally Posted by steelcomp

You have a completely mis matched combination of parts, it sounds like. You need to decide what your goal is and reverse design the engine from where it is. Your combination as is should make plenty of power, so I'm guessing right off the bat you have the wrong cam. Might make sure of things like timing and that the carb's opening all the way, but I would think you've done that by now.

He had me at Clay Smith


Is the cam degreed in ? Do you have a blower cam in a N/A engine ? As Scott has stated over and over combination , combination you need someone like him to sort that thing out. A 1,050 would be just fine for it once your get to that point but you have a way to go before you need to worring about the carb.

S CP

Originally Posted by gn7

That works out to what? 100+ to 1 CR. Pump is out of the question May diesel

LOL...I read that as a .200 dome.

Originally Posted by Sleeper CP

He had me at Clay Smith


Is the cam degreed in ? Do you have a blower cam in a N/A engine ? As Scott has stated over and over combination , combination you need someone like him to sort that thing out. A 1,050 would be just fine for it once your get to that point but you have a way to go before you need to worring about the carb.

S CP

George Streagle is a sharp guy, and knows jet boats, but that doesn't mean he chose or recommended the cam. "Built for a TR with nitrous" makes me think that now that it has a single four on it, it's a morphodite, and nothing is matched. The basic parts combination seems OK...the cam is what brings it all together. (I know you know that sleeper...)