what size of blower do I need
 

I 'm running a 622ci bowtie splayed block, 4.625 bore, 4.625 stroke, callies crank, oliver rods lunati cam, gm high perf. alum. heads JE 10.5:1 pistons, jessel valve train and timing belt and MSD ignition, engine dynoed at 837hp@5800 rpm and 858ftlb@4700 rpm, boat is running mid 90's, I would like to get it over the 100 mark, I'm just about out of options for a natrally asperated motor, so what size of blower should I look for and what should I drop the compression to. I would think it wouldn't take much to push it to 1000hp, but I'm sure this is a position a lot of you have been in. ANY THOUGHT'S
Thanks in advance
larry

come on< I know someone has a recomendation, give it up.

well I would lower compression to 8.5:1 and drop a 12 or 1471 on....nice motor, I had a 10.5:1 632" NA motor a few yrs back. you can get 1000hp with low, low boost 4-6#.

You are not out of options....Another way you could probably get to 1000hp is to go with a set of Dart 18 degree 370 Oval ports, and cam change...problem is you have to get a sheet metal intake made for the 18 degree stuff....but those are awesome heads. :ernaehrung004:

max 8.5 compression and whipple, procharger or vortec with an intercooler. With one of these you will get the most HP for lb of boost.

a 14/71 is what i had in mind, the pistons I have are new (less than 5 hrs) JE said they could cut them down to what I wanted, I don't want to run an intercooler if I can help it, I figure with lots of air and low boost (4-6) it should be ok, I've looked at the whipples, but not sure if 1 whould do it, and a quad with efi is big, big bucks, and I don't care for the blow through sys. fuel ingection is an option, but I'm an old carb guy.
thanks for the info guy's
I will take all I can get.
larry

Big blower, turning slow, at low boost will not need a chiller especially with Aluminum heads...:ernaehrung004:

Why no chiller?

What Octane you going to use?
Big blower turning slow wont idle well and your plugs will load up quickly.

I was thinking a 14/71 also. 622CU/IN is a hell of a lot of motor to feed. I'd give the guys at PSI a call. I'm sure they will get you on the right road.


Darrell.

I agree with the 14/71,2 big doms also.I would think you could run it with out a innercooler, but I would dyno it to get a tune up on it,cheap insurance.

I would not cut the pistons , most of the higher compression pistons will have a thinner dome/piston top ...Most? But if they say there enough there ...the ring land needs to be .300+ down.espicaly if your not going with a innercooler.

I would call Marv at www.boostdaddy.com and look into a Blowershop blower,You can pick his brain also,:D

your prob going to need a blower cam also

I hope ya have a speedmaster:eek:

1471 will more than feed a 600" motor...PSI's are cool...but you really need to be turning upper 6's to 7000+ rpm to see any real advantage.

Why do you say this? If the carbs are right it won't ever load up, has nothing to do with the blower. Granted we could get into other issues, cam design, ignition, etc...but the blower has noting to do with it....:hitfan:

You will need to start by buying pistons first. I run 8.5:1 comp. on many of my pump gas supercharged packages. I would run a 1471 size supercharger for sure on this application with to dominator style carbs. Please feel free to contact me, I can give you the best pricing around on every component you need with our 50 years of business. (216) 398-8500. Thanks again!

Dean Gellner

the fuel i'm looking to run is good old lake powell 91, part water, part fuel, just kidding, over the years it has been pretty good, water sep, has stayed clean, here in utah, the best pump fuel you can buy is 91, I don't want to get into the octane booster, been there, pain in a--, I'll cut the timing back to 28 to keep things together. I am running an Imco 12" extension with a 3" rise, the scoop on the hatch is large, but not large enough to accomodate a 14/71 with a chiller, thats the only reason I'm looking to stay away from a cooler, I will give marv at psi a call as strip suggested, now single carb, or twin, where would you get them?

Marv is at www.boostdaddy.com not PSI. Also Dean Gellner can hook ya up, He's on the same page as were talking about. Give him a call also!!:D

CALL DEAN , your nuts if you don't, he just helped MIKE on here with a 572,,1071,1000hp that he needed help setting up DEAN did not do the rebuild to the motor but helped a lot, he can get you the 1471, carbs and tell you if your cam is ok. my other friend just got rid of some PSIs there only 10,000 a piece and you have to spin them high. the 1471 is half that. DEANS THE MAN he has lots of motors in the high end boats OLs, SKATERS, one thats going to turbines. art

Blower questions
 

Respectfully, I would say that your issue is not an engine question. Your issue will be a drive issue. Buy lots of new ones early and often.

I agree about talking with Dean also, but at 10.5:1 with a big blower turning that slow is not the ticket here...the fuel will stick to the rotors at slow speeds, idle.
Try an 8-71 at 2 psi. with 750's....91 will only support that.
Or your going to have to re-piston the for more boost.

The last time I was on Powell.... all we could get was regular... :mad:

Agreed, 8.5:1 with a big blower turing slow is what I was referring to..:ernaehrung004: like a 14 turning 5% under...

Have a little faith in the old IMCO SC, 1000hp might stain it a bit, but I'm also runnig at 3600ft, so there is a little power loss due ti altitude.

I am aware that 10.5:1 is to much, JE say's they can cut them down to 8.5:1 with no loss to the integrity of the piston.
I plan to talk to dean,he sent me a pm and said he could help out, as far as the fuel on powell, there are 2 places on the lake to get it, wauwepe to the south and halls crossing in the middle.
thanks for all the input guy's
what about carbs, 4500's or 4150's
twin 4500's seem like overkill for 6psi and 6000 rpm's