Which Is Faster - 600hp@6200 or 600hp@7100

General engine tech -- Drag Racing to Circle Track

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joe 90
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Re: Which Is Faster

Post by joe 90 » Sun Sep 24, 2017 5:55 am

vortecpro wrote: A 427 that makes 600 HP @ 6200 RPM
A 427 that makes 600 HP @ 7100 RPM
Nobody has yet mentioned the shape of the torque curve?

How would you build those 2 engines?
The first one.....drop the CR and ad a pair of small turbos. With low boost you might see those numbers?
The 2nd one......high CR, a hot cam and big breathing .


Which would be quicker?
Boost wins.

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Re: Which Is Faster

Post by digger » Sun Sep 24, 2017 5:56 am

vortecpro wrote:
Pretty simple isn't it.........Its always about moving the power UP
I'd rather make more hp than make same hp but move peak hp rpm up

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Re: Which Is Faster

Post by digger » Sun Sep 24, 2017 6:46 am

The easy way is to consider the most efficient transmission which is a 100% efficient cvt. keeps the engine at peak hp at all times which maximises torque to rear wheels at all times and thus maximises the propulsion forward at all times.

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Re: Which Is Faster

Post by John Wallace » Sun Sep 24, 2017 6:56 am

Doesnt seem anywhere close to your math? so.................
Digger quote:
It's simple

Hp=tq x rpm / 5252 rearrange the equation

Tq = hp x 5252 / rpm
Exactly as digger wrote.
It's all math.

:)
600 hp at 6,800 rpm and 526 lb-ft of torque at 4,800 rpm
600 HP at 6800 RPM = 463.41 TQ
526 lb/ft at 4800 = 480.73 HP

:)

HP-TQ Calc

:)
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Re: Which Is Faster

Post by swampbuggy » Sun Sep 24, 2017 2:44 pm

Yea Bob i agree with what you said, and have come to the conclusion that you have to have great cylinder heads to accomplish that, that being a greater distance between peak tq. and peak H.P. ?? Thanks Mark

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Re: Which Is Faster

Post by woody b » Sun Sep 24, 2017 4:11 pm

I've always said a good engine is a good engine. Some people say you need XX for a heavy car, but YY for a light car. I've always believed the trick was gearing, convertor to match the engine, and car. I'd never really thought about RPM but it makes sense the screamer would go faster, assuming proper gearing ect.

Someone mentioned big truck diesels and torque earlier. Let's compare a DD13 Detroit diesel to a comparable 800ish cubic inch race engine. (I don't think the turbo "really" matters, just power) The DD13 has 470 horsepower and 1650 pounds of torque. An 800ish cubic inch race engine could have something like 3 times the horsepower, and 2/3s as much torque. (guessing) Properly geared ect I suspect the race engine would get the 80,000 pound load up the hill quicker. However, the 2000 rpm diesel with similar cubic inches will last a million or more miles.
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Re: Which Is Faster

Post by David Vizard » Sun Sep 24, 2017 8:36 pm

vortecpro wrote:I'am going to ask the same question I asked on the Chevelle forum.


"Which engine is faster down a dragstrip and why"




A 427 that makes 600 HP @ 6200 RPM
A 427 that makes 600 HP @ 7100 RPM

?
Absolutely and without doubt the 427 making 600 hp at 6200.

I will explain when I return from down under next week.

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Re: Which Is Faster

Post by The Radius Kid » Sun Sep 24, 2017 8:55 pm

David Vizard wrote:
vortecpro wrote:I'am going to ask the same question I asked on the Chevelle forum.


"Which engine is faster down a dragstrip and why"




A 427 that makes 600 HP @ 6200 RPM
A 427 that makes 600 HP @ 7100 RPM

?
Absolutely and without doubt the 427 making 600 hp at 6200.

I will explain when I return from down under next week.

DV
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Re: Which Is Faster

Post by MadBill » Sun Sep 24, 2017 8:55 pm

vortecpro wrote:I'am going to ask the same question I asked on the Chevelle forum.


"Which engine is faster down a dragstrip and why"




A 427 that makes 600 HP @ 6200 RPM
A 427 that makes 600 HP @ 7100 RPM

?
So, did it blow up about like this over there? #-o
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Re: Which Is Faster

Post by ptuomov » Sun Sep 24, 2017 8:56 pm

I'm still half expecting someone to say that it depends on the rod length...
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Re: Which Is Faster

Post by lefty o » Sun Sep 24, 2017 9:14 pm

ptuomov wrote:I'm still half expecting someone to say that it depends on the rod length...
probably the one with the 8.1" rod :lol:

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Re: Which Is Faster

Post by swampbuggy » Sun Sep 24, 2017 9:17 pm

Ptuomov------laughing my butt off!!

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Re: Which Is Faster

Post by cjperformance » Sun Sep 24, 2017 9:19 pm

ptuomov wrote:I'm still half expecting someone to say that it depends on the rod length...
:lol: no no no ,,, I smell a rat ... ITS THE OIL !
Craig.

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Re: Which Is Faster

Post by vortecpro » Sun Sep 24, 2017 9:27 pm

David Vizard wrote:
vortecpro wrote:I'am going to ask the same question I asked on the Chevelle forum.


"Which engine is faster down a dragstrip and why"




A 427 that makes 600 HP @ 6200 RPM
A 427 that makes 600 HP @ 7100 RPM

?
Absolutely and without doubt the 427 making 600 hp at 6200.

I will explain when I return from down under next week.

DV
David

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Re: Which Is Faster

Post by Geoff2 » Mon Sep 25, 2017 5:33 am

I said on page 1 the 6200 rpm engine would be faster. Look forward to what DV has to say.

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