How much nitrous can my engine handle? - 460 Ford Forum
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post #1 of 15 (permalink) Old 05-02-2010, 09:37 PM Thread Starter
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How much nitrous can my engine handle?

I know you probably get this a lot, but I was wondering if anyone has had any experience with a similar combination and has any advice for how much nitrous my 460 can handle.

D0VE block, 2-bolt main - 502 cubic inches
Scat 9000 4.125 stroker crank
Eagle forged H-beam rods
Ross forged 14:1 nitrous pistons
Fully ported iron C9VE heads
Solid roller 272/284 @ 0.50 - .726/.726 on a 108
5400 RPM stalll converter
Car weighs about 3150lbs

Let me know if you need to know anything else. I plan to run 110 octane fuel. I have a tunnel ram with a NOS dual carb Cheater nitrous system with 150-250 HP jets and a NOS Sportsman Fogger kit with 175-250 HP jets.

I plan to run them in stages. I have a Holley Blue pump running the nitrous systems and a single 10lb bottle. I do not have the high-flow valve installed so NOS claims it cannot supply more than 400 HP worth of nitrous. The fuel system for the nitrous should handle up to 500 HP worth of nitrous.

So, between the two kits, can I safely run 350 HP worth of nitrous? What about 400 HP? If I ran both bottles separately could I run 500 HP with my combo? The engine makes 714 HP on motor (at the crank).

Who has experience with this?

Thanks!

Cyco

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post #2 of 15 (permalink) Old 06-30-2010, 09:47 AM
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NOS

Hey
Where ya located ?

All I know is I had a similar set up .. ran a 250 shot for about a year and the first thing to go was the H-Beam rod.
I ran a set of DOVE-A heads fully ported/polished with SS Valves, a good chrom-moly rocker and everything was studded -

Same thing nitrous pistons and rings - everything forged

Mine was not stroked but... it loved the nitrous until 1 day it didn't.
Are your pistons forged aluminum ?

Make sure that motor is balanced to a penny ! Like no exceptions !
If its not the NOS will tear it apart even faster!
Especially if your runnin a dual shot - wow

What are you running for ignition ? Standard dizzy or you running electronic?

Nitrous loves to eat aluminum pistons so I would stay away from those.

And how did you get the 700HP off that motor ? Was that with a 250 shot ?
I have built a few 460 and 454 and without aluminum heads cant get close to 700 HP !

How do I upload pictures ? I can put a picture of my nitrous eaten motor on here ! haha
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post #3 of 15 (permalink) Old 07-02-2010, 08:40 AM Thread Starter
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I'm in Cleveland, OH.

Yes, custom Ross Racing forged aluminum nitrous pistons.

It's definitely been balanced. We're good to go there.

Stock distibutor with a Crane electronic conversion, locked out, with an MSD ignition and MSD timing computer.

Two words - HUGE CAM. The compression doesn't hurt either.

Not sure how to upload pics.

Thanks for the info!

Since getting all the feedback I have gotten, I've decided to scale back on the nitrous. I sold my Sportsman Fogger kit and will be running a mere 200 HP shot on the dual plate Cheater kit. Should put me around 900 HP on the bottle.

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post #4 of 15 (permalink) Old 07-02-2010, 11:51 AM
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Your rods and crank are not going to be happy.

If you're not living on the edge you're taking up too much space!
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post #5 of 15 (permalink) Old 07-02-2010, 12:13 PM
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14:1 + No2 = not good on 110 octane...... infact a real 14:1 and 110 is not a very good idea.
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post #6 of 15 (permalink) Old 07-02-2010, 05:45 PM Thread Starter
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Well I can always run higher octane...

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post #7 of 15 (permalink) Old 07-05-2010, 07:00 PM
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I would think that you are already pushing the limits of that crank and the 200 shot of smack is gonna make it short lived. I am thinking the shorter stroke you are using may be to your benfit vs. same material crank in a 4.3 or 4.5 stroke so I think that may help. Be very conservative with the tune and you may be good to go.

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post #8 of 15 (permalink) Old 07-06-2010, 06:41 AM
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That kind of compression will require much more octane than 110 , especially with the nitrous . Competition Race Fuels makes some excellent nitrous fuels and they have a distributor in your area . Call Finish Line Racing Fuels 419-366-3675

Mike Croley
dist. for Competition Race Fuels
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post #9 of 15 (permalink) Old 07-07-2010, 05:13 PM
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Quote:
Originally Posted by Mike Croley View Post
That kind of compression will require much more octane than 110 , especially with the nitrous . Competition Race Fuels makes some excellent nitrous fuels and they have a distributor in your area . Call Finish Line Racing Fuels 419-366-3675

Mike Croley
dist. for Competition Race Fuels
The phone number for Finish Line Fuels in Ohio is incorrect . The right number is 419-366-3575 .

Mike Croley
dist. for Competition Race Fuels
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post #10 of 15 (permalink) Old 07-08-2010, 01:06 PM Thread Starter
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Thanks guys!

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post #11 of 15 (permalink) Old 07-10-2010, 05:52 AM
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the scat 9000 is a cast crank right? if so i think your crazy for putting that much nitrous to the motor. your going to end up with a crank hanging out of the oil pan in my opinion. if the 9000 is forged you may be alright for a short time.

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post #12 of 15 (permalink) Old 07-11-2010, 12:47 PM Thread Starter
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Yes, the Scat Comp 9000 is a cast crank. But since getting all of the feedback on here I had already decided to dump the second stage of nitrous and just hit it with the 150-250 shot of my dual plate NOS Cheater kit. Based on everything I have heard, 850 HP is about what my stock 2-bolt D0VE block can handle, which would mean running a 150 HP shot on my current mill. I guess I'm more curious now if the engine can handle between 900-950 HP on nitrous, and for how long, vs. the original idea of running 1200+ HP on nitrous.

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post #13 of 15 (permalink) Old 07-13-2010, 12:39 AM
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we have ran 300 on cast cranks a lot,no problems, but never with 110,

you need114 or 116 w/14.1 comp. its the tune that you must be carful with.

you should start lower 150 or so, then go up

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post #14 of 15 (permalink) Old 07-18-2010, 07:07 AM
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Quote:
Originally Posted by BOSS 429 View Post
we have ran 300 on cast cranks a lot,no problems, but never with 110,

you need114 or 116 w/14.1 comp. its the tune that you must be carful with.

you should start lower 150 or so, then go up

x2 its all about the tune .... put the right fuel in and start small , ck the plugs on a short pass and adjust from there .....





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post #15 of 15 (permalink) Old 07-18-2010, 11:43 AM
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I'm thinkin' that Aluminum rods might help to soak up some of the abuse.......

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