Visit The Dirt Forum for More Information

Author Topic:   Need an idea of about horsepower
chapa73
Dirt Maniac

Total posts: 169
posted March 01, 2005 02:45 PM  
I dont have a desktop Dyno or anything like that butwas wonderign about how much Horsepower I will have,I hate to take your time with it.
462 double hump heads 2.02 valves
1.5 rollers
MWM # 7 cam
5.7 scat bushed rods
.275 speed pro pistons
scat 9000 crank 48# stock stroke
Power Plus High rise intake
C&S 750 Alky Carb

You can go with mabey a stock deck hight,I dont know how much will be shaven off the block when I get it back.
You can also figure like a basic fel pro head gasket.

Thanks very much in advance.



gould
Dirt Forum Champ
Total posts: 730
posted March 01, 2005 06:08 PM  
Thats one year of b-mods i heard.

heres what i got with your setup
505hp @ 6500
475tq @ 5000

with a set of 220cc dart iron eagles with 2.08in and 1.6ex i got this

557hp @ 7000
474tq @ 5000

------------------
www.geocities.com/gouldracing11

racin78p
Dirt Freak

Total posts: 333
posted March 01, 2005 07:37 PM  
Just to make sure we are all on the same page here,....

The BIG clue to the "potential" horsie numbers is the HEADS; 462 camels, won't flow the numbers you need to get that kind of power. PERIOD. I was going to write more here, but I am done. Go race. Get on with it. GOOD LUCK TO ALL THIS RACE SEASON!!! And please be safe and bring it all home!

Race on.

------------------
racin78p
if it ain't fun, then don't run

chomme
Dirt Freak

Total posts: 300
posted March 01, 2005 11:27 PM  
Thanks,I know there are alot better heads on the market than some double humps,I would love to buy a set of darts,but when Im on a tight budget this year the 462 double humps ready to go are alot cheaper than darts right now.

Thanks Guys

GO 24
Dirt Freak

Total posts: 366
posted March 02, 2005 10:52 AM  
No offense gould but I'd give up my 1st born to get 557hp in my IMCA LM motor and that's even when we pull off the 390 and put on a good 750!

stockcar5
Dirt Forum Champ
Total posts: 578
posted March 02, 2005 10:55 AM  
i think i am missing something??? what size motor? 355, 406??

for referance a buddy of mine had the same combo with the same cam in a 406 and made 525hp..not desktop dyno either.

------------------
www.geocities.com/dirtstockcar5

iowatoolman
Dirt Freak

Total posts: 369
posted March 02, 2005 03:00 PM  
well i don't know how you guys are entering the information into desktop dyno but last year i chassis dynoed my car and ran the numbers into the desktop dyno and came with in 1% figuring about a 30% loss thru the auto trans...

sorry but that is what i came up with but i had all my cam specs valve timing #'s and all

drive hard or drive home

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted March 02, 2005 05:47 PM  
Just wondering how you came up with the 30% i have chassis dynoed in the past and was told 20 to 25% but i went on the low side because i had light weight clutch trans spool and gears. Is there a formula that a guy could use? I would like to pin the # down a little better if i could.

chapa73
Dirt Maniac

Total posts: 169
posted March 02, 2005 05:50 PM  
For my application its a 355
I was just kinda wondering about how much horsepower,

Thanks again

stockcar5
Dirt Forum Champ
Total posts: 578
posted March 02, 2005 06:02 PM  
30% seems high. i was told 18% with low drag transmissions and rear ends like brinn ect..

------------------
www.geocities.com/dirtstockcar5

racin78p
Dirt Freak

Total posts: 333
posted March 02, 2005 07:58 PM  
I can't believe I am doing this,...

Stockcar5: you bet your behind a 406 can tech out at 525. High end I'd say (with parts already mentioned here), but the right engine builder and right parts and massaging,...

Chassis dyno's will vary in how much the percent of "loss" in hp to the rear wheels is, depending on the equipment of the chassis dyno and the OPERATOR of said equipment. I have been there and done that and that is all I will say. If you really want to know how much power your engine (s) are making, go get it (them) dyno'ed. Just the engine. There is so much controversy about chassis dyno numbers that I personally have little faith in what they read out as. Too many things can change the numbers. The thing to remember is, you just can't compare your chassis numbers to another guys because of the differences in drive train, ext. THEY DO MAKE A DIFFERENCE WHEN PLANTING THE POWER TO THE GROUND. As Rome says "I'm out". Good luck and race on, guys and girls.

------------------
racin78p
if it ain't fun, then don't run

stockcar5
Dirt Forum Champ
Total posts: 578
posted March 03, 2005 11:01 AM  
i guess i forgot to mention all of my dyno numbers some from a superflow 9001 engine dyno and not a chassis dyno. also the 406 i was talking about was built by the divers father, not a bigtime engine builder with exotic parts.

------------------
www.geocities.com/dirtstockcar5

GO 24
Dirt Freak

Total posts: 366
posted March 03, 2005 02:30 PM  
Mine's a 358 2 bolt w/splayed caps, Callies crank, Ross lightweight pistons, Eagle lightweight H beam rods, Bowtie heads-2.02/1.60 valves, BG 750 carb, "old" style performer intake. Right at 525 with the 4bbl and not quite 500 with a VERY pricey 4412 2bbl. Were limted on IMCA rules so the intake hurts it quite a bit.

racin78p
Dirt Freak

Total posts: 333
posted March 03, 2005 07:17 PM  
Stockcar5 and Go 24: Once again, just MY opinion, but your numbers look good to me. Realistic. Well built engines will get the horsies you have posted. And a BIG TIME engine builder doesn't have to put it together to get them. Patience, and detail get those numbers.

Uhhhhgggg,....

------------------
racin78p
if it ain't fun, then don't run

iowatoolman
Dirt Freak

Total posts: 369
posted March 04, 2005 11:38 PM  
just so you guys know where i got the 30%

i ran a t350 trans in low gear and a full carrier with a powertrax locker in the rear so i figured high since i am not running a manual trans and full spool

and got the number out of a book i will look for the book to let you know what it is

drive hard or drive home

Rollin Thunder
Dirt Full Roller

Total posts: 30
posted March 06, 2005 07:22 AM  
Unported double hump heads CANNOT make 500 horsepower.

sc1 racing
Dirt Freak

Total posts: 419
posted March 16, 2005 01:30 PM  
how about this engine combo

350 .060 over, decked, balanced scat assy, 43 lb crank, bullet .518 lift 276 dur cam
flat top 2 valve releif pistons, set of 461x lightly ported heads with a hurricane intake, and trick holley 500 carb.

i am just guessing at 350. havent even fired it up yet.

Back to the Archives