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Old 01-18-2010, 04:45 AM
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Experience with mild 454 with NOS

Hi wise ones... I have just ordered all my parts from the good ol' States to make there way down here to New Zealand.

I would like to know if any of you have had experiences with a mild 454 with a shot of NOS, engine specs as follows, I'd like your thoughts on horsepower and E.Ts...

Stock 2 bolt 454 14015445 - stock crank, rods, pistons - I haven't run this engine yet so I am guessing it will be ~7.8-8.1cr
Stock 049 Heads with stock valves and rockers
Lunati Voodoo 60203 Cam and Lifters (268/276, Duration @ .050 (Int/Exh): 227/233, Lift (Int/Exh): .542/.554, LSA/ICL: 110/106)
Edelbrock RPM Air-Gap manifold
Holley 800 Double Pumper
K&N Xstream Air Filter and Lid
HEI Distributor
Holley Blue fuel pump and regulator
Davies Craig 110litre(29 gallons)/minute electric water pump
1 & 3/4 Headers
Holley 05101NOS Super Powershot Nitrous System (1lb, 1.25lb, 1.5lb @ 10secs) what shot would be best, I assume this engine could take the 1.5lb?

Not much relevance but this will be in 3100lb vehicle with TH400, 3.08 rear and 24" tyres.

Cheers

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Old 01-18-2010, 08:55 AM
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No bbc NO2 expericence but have sprayed many sbc.

Hope you changed the valve springs with that cam.

Use an oil additive, as bbc's tend to eat cams (especially cams like you have). zddplus.com makes a good additive. get a case so you can use one at each oil change. also break the cam in with stock springs but use the aftermarket retainers (taller spring installed height). Make sure the stock spring can handle that much lift.

compression is low for that cam (9:1 would be ideal). I guess the engine has flat top pistons. look for some early and mid 1970's 402cid heads (820's). they have 112cc chambers which is smaller than the 049's 120cc. they would rise cr to 8.5:1. then use a thinner head gasket (0.020") for 8.75:1cr. Going up 0.75:1 cr wold be worth 20hp/30 ftlbs in this case.

anyways.... I'm guess about 400hp/450ftlb with your current setup. The engine can take about 150hp shot of NO2 which would make 550hp/600ftlb.

et with a 3100lb car, 3.08 gear, 24 in tire would be around 12.5 at 110 mph on the motor and 11.3 at 122 mph with the n02. et's could vary +/- 0.500 seconds depending on traction.

you will need another flow pump for the n02 enrichment.

That holley blue pump will be louder than the engine.
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Old 01-18-2010, 12:58 PM
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Thanks 454C10, s my compression just compromsing an increase in horsepower or will it actually make the current power more sluggish as opposed to a same horsepower engine with higher compression? Also, I understood that the Holley Blue pump would just run the gasoline and the NOS kit had all it needed to work correctly? Are you saying a need to pump the NOS? Thanks for your wisdom!
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Old 01-18-2010, 06:58 PM
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the lower compression will make the engine a little sluggish. but a little more ignition timing will help that.

n02 systems have two ports. one for n02 and one for the extra fuel. Changing out jets in the n02 system to adjust the power. the n02 jets have a matching fuel jet.

I don't think a holley blue pump will handle a BBC with n02.

when you arm the n02 system the n02 fuel pump should come on also. You don't need much pump for a 150 shot. 50 to 70 gph should be safe for a 150 shot.
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Old 01-18-2010, 07:11 PM
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So preferrably I should have two fuel supply lines with seperate pumps supplying the engine with the primary as per normal through my Holley Blue and the secondary through, foir example, a Holley Red that powers up when NOS is armed?

Iniitally could I just have my Holley Blue supplying both fuel lines and see how it goes?

Thanks for your help, it'll save me a lot of headaches!
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Old 01-18-2010, 07:23 PM
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Quote:
Originally Posted by kahl_454
So preferrably I should have two fuel supply lines with seperate pumps supplying the engine with the primary as per normal through my Holley Blue and the secondary through, foir example, a Holley Red that powers up when NOS is armed?

Iniitally could I just have my Holley Blue supplying both fuel lines and see how it goes?

Thanks for your help, it'll save me a lot of headaches!
I would not rely on just one pump for this. The last thing you want to do is lean the motor out. Do it right now or do it over later.
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Old 01-18-2010, 07:28 PM
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Quote:
Originally Posted by kahl_454
Hi wise ones... I have just ordered all my parts from the good ol' States to make there way down here to New Zealand.

I would like to know if any of you have had experiences with a mild 454 with a shot of NOS, engine specs as follows, I'd like your thoughts on horsepower and E.Ts...

Stock 2 bolt 454 14015445 - stock crank, rods, pistons
If you don't do anything else- see that you have enough end gap on the rings!!! If they butt together, you will have trashed the engine pretty good.

Use at least 0.005" per inch of bore for the top ring gap. 0.006" might be safer yet, but you can go too wide, no need for that. The second ring gap can be a little tighter. A lot depends on how big of a hit you're going to use.

I'd even go as far as to say to buy a good premium set of rings like Hell Fire, and go w/their gap recommendation. That way, at least the rings will not be a problem...
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Old 01-18-2010, 07:54 PM
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cheers, maybe if I trash the rings/block my wife won't be able to moan about the cost of stroking it! may be a blessing in disguise!

Also, would it be feasible to supply the carb via my stock mechanical fuel pump and run the NOS system on the Holley Blue?
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Old 01-18-2010, 11:06 PM
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Hi. Is this going in your WB? If you were interested in using this for drag racing, for a comparison of a similar car I brought a 476 (454 +.100") off a guy up your way you might know (phil hargreaves?) or have seen racing. He had it in a yellow HQ holden sedan and did 10.5@125mph. It has similar HP to your 550hp estimate, pretty sure it had 4.11 gears, high stall (can't remember size) and 28" slicks. But it did appear to hook up well which might be a problem with that amount of grunt . I saw a video of it on the net some where.
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Old 01-19-2010, 12:52 AM
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Cheers, yeah I have seen his name around. Yes traction will be an issue especially in a 1300kg ute!
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Old 01-19-2010, 09:33 AM
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sure. use the mechanical pump for the engine and the electric for the n02.
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Old 01-19-2010, 03:30 PM
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cheers 454C10, I can't wait to see what my setup can do!
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