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-   -   speed pro forged pistons? (http://www.hotrodders.com/forum/speed-pro-forged-pistons-226653.html)

bottlefed55gasser 11-29-2012 06:46 PM

speed pro forged pistons?
 
Any one have any experience with these pistons and nitrous? Thinking about throwing them in a budget daily driver 350 and spraying a 200 shot on it.

BOBCRMAN@aol.com 11-29-2012 07:05 PM

A tough piston. Properly clearanced and correct ring gap they will work fine.

1Gary 11-29-2012 07:15 PM

200 shot??. Well you would have the pistons covered if you do what has been posted. But how about the rest of the build??.

bottlefed55gasser 11-29-2012 08:27 PM

355, 010 block, stock crank, procomp h beam rods, speed pro forged flat tops, old school crane solid roller 501/501 lift, 236/244@ .50. On a 112 lsa. Summit aluminum heads with the 200 cc runners I believe there basically like a brodix ik200. Hardland sharp 1.5 roller rockers and a Vic Jr with a Holley 750 dp.

1Gary 11-29-2012 10:21 PM

You got a good primary and secondary fuel source??.

bottlefed55gasser 11-29-2012 10:27 PM

I've heard mixed stuff about procomp, there so so I think for the price of 100 bucks from a buddy brand new I can't complain. I was thinking a Holley black should cover it, unless you believe I need a stand alone fuel system.

bottlefed55gasser 11-29-2012 10:28 PM

Yeah I figured I'd run 110 whenever I sprayed it.

prostreet6t9 11-29-2012 11:36 PM

Having a fuel supply in the engine compartment is probably not the best idea. If you ever decided to take it to the track they'd shut you down real fast.

632Mantis 11-30-2012 12:02 AM

Quote:

Originally Posted by bottlefed55gasser (Post 1617257)
355, 010 block, stock crank, procomp h beam rods, speed pro forged flat tops, old school crane solid roller 501/501 lift, 236/244@ .50. On a 112 lsa. Summit aluminum heads with the 200 cc runners I believe there basically like a brodix ik200. Hardland sharp 1.5 roller rockers and a Vic Jr with a Holley 750 dp.

Sounds like a winning combination to me. Spray it!
Speed Pro forged slugs are good. No worries.
Just keep the RPM's reasonable, or that stock cast crank will start flexing.
( Did you have your crank assembly custom balanced? ALWAYS a good idea. )

bottlefed55gasser 11-30-2012 12:03 AM

Well the car is gonna be a old school gasser a fuel cell up front would look sweet

632Mantis 11-30-2012 12:04 AM

Quote:

Originally Posted by prostreet6t9 (Post 1617303)
Having a fuel supply in the engine compartment is probably not the best idea. If you ever decided to take it to the track they'd shut you down real fast.

Nope. It's a common thing actually. I see lots of small fuel cells up front by the engine at the racetrack.

bottlefed55gasser 11-30-2012 12:05 AM

Quote:

Originally Posted by 632Mantis (Post 1617310)
Sounds like a winning combination to me. Spray it!
Speed Pro forged slugs are good. No worries.
Just keep the RPM's reasonable, or that stock cast crank will start flexing.
( Did you have your crank assembly custom balanced? ALWAYS a good idea. )

Not yet, it's up in the air, I have a 400 sbc also its a toss up between the two either or need pistons, I just feel the 400 will cost more.... I have pistons for the 400 but the cr is way way too high

632Mantis 11-30-2012 12:14 AM

Quote:

Originally Posted by F-BIRD'88 (Post 1617292)
You'd be best to run two separate fuel systems.

I would install a small fuel cell under hood, along with a fuel pump and fuel pressure regulator.
for the nitrous system. Fill this fuel cell with 110+ octane unleaded race gas.
A carter P4594 pump and 3/8" fuel line is plenty for this.
Another Carter P4594 at the back of the car will support the engines fuel needs
run the engine on 92+ octane premimum and the nitrous on 110.

Very simple. and you will have it covered. get a fuel pressure gauge that reads in 1/4 lbs accuratly
You will find this very effective in fine tuning the nitrous system.


Most people run a good single pump, a regulator and a splitter with a gauge to monitor the pressure. No need for 2 different fuels, just run race gas when you race.

Having said that, I do agree with everything you said. Your idea would certainly work fine, and I was thinking about doing a setup like this on my truck. I am running a mechanical 6psi fuel pump, and I am not sure it would properly feed my carb AND my nitrous plate together.
I believe I would have a pressure drop, and my nitrous system needs to maintain 5-6psi while spraying.

The 3 things that kill a nitrous engine are: lean fuel ratio, too much ignition timing, running fuel that does not have the proper octane rating.
( also safe to go with a colder rated spark plug above 150 shot )

632Mantis 11-30-2012 12:20 AM

Quote:

Originally Posted by bottlefed55gasser (Post 1617314)
Not yet, it's up in the air, I have a 400 sbc also its a toss up between the two either or need pistons, I just feel the 400 will cost more.... I have pistons for the 400 but the cr is way way too high

2 things I don't like about the 400sbc are:

1. Siamese cylinders and steam ports
2. Short rods.

#2 is why you always see people turning a 400 into a 377 or 383.
Destroke it, and you can run 6.0" rods with the right piston set.
( I'm a big fan of LONG connecting rods. )

1Gary 11-30-2012 01:35 AM

Quote:

Originally Posted by F-BIRD'88 (Post 1617305)
This is not true. On a drag car this is the preferred location for the fuel cell.
It is much safer under hood.
As long as it is mounted and plumbed correctly, it is fine and will pass track tech.
Be sure that the length of flexible hose that runs from the firewall to the engine
for the nitrous system is good braided steel line.
Small 1 gallon to 3 gallon upright style fuel cells that mount underhood are readily available.
Thats what they are for.

If you look, at the track you will find many drag cars with the fuel cell and fuel system all underhood
whether a nitrous car or not. Ther are many advantages to having the fuel cell and pump mounted under hood,
including safety. Including the fact that the volume of fuel onboard is much less.
Having the fuel cell mounted close to the engine negates the need for high fuel pressure.
5 to 7psi for the carb is just fine and 5 to 8 psi is fine for the nitrous system with a adjustable regulator.
The nitrous fuel system response and pressure regulation is much more consistant.

Yeah but.............

http://i172.photobucket.com/albums/w...Crew-for-P.jpg

Opps!!!.

The above aside,not real keen on having engine heat confined to the engine compartment heating the fuel.Don't matter that much with a EFI system,but with carbs it does.


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