how do i get to 7000rpm red line

S

stanggt00

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Jul 16, 2003

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baltimore md

Mar 31, 2006

#1

• Mar 31, 2006

• #1

ok my question is simple most of the 4.6 stangs have a red line of about 6-6.5k
what i want to know is whats more important the heads or the bottom end when it comes to moving the red line of a motor up

example it in the heads is it the camms or valve springs
in the motor is it the type of rods or crank

or could it just be in the computer or a combo of all of these things



my goal here it to put together a nice motor that can hold about 500-600hp
with a red line of about 7000rpms

 

sgarlic

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Apr 21, 2001

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Mar 31, 2006

#2

• Mar 31, 2006

• #2

Everything you mentioned is involved, but the main thing keeping us from 7k is the crankshaft.

 

reddrgn01gt

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Jun 8, 2005

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Pittsburgh, PA

Mar 31, 2006

#3

• Mar 31, 2006

• #3

Too hold that kind of power and spin that high you will need a forged bottom end and cams + valve springs.

 

CanadaStang

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Sep 7, 2003

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Mb

Mar 31, 2006

#4

• Mar 31, 2006

• #4

stanggt00 said:

ok my question is simple most of the 4.6 stangs have a red line of about 6-6.5k
what i want to know is whats more important the heads or the bottom end when it comes to moving the red line of a motor up

example it in the heads is it the camms or valve springs
in the motor is it the type of rods or crank

or could it just be in the computer or a combo of all of these things



my goal here it to put together a nice motor that can hold about 500-600hp
with a red line of about 7000rpms

Click to expand...

Generally the first bad thing to happen is PTVC.

 

0

01Steeda

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May 29, 2005

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Mar 31, 2006

#5

• Mar 31, 2006

• #5

CanadaStang said:

Generally the first bad thing to happen is PTVC.

Click to expand...

thats what happened to me lol.

cams/valsprings.. crank.. should do it. I wouldnt say I am at a 7000 redline, but my rev is set there now

 

DropTopPony

Noob Slayer

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Aug 13, 2002

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south jersey

Mar 31, 2006

#6

• Mar 31, 2006

• #6

buy a cobra

 

DBMSTNG

I fantasize about it being BIG!

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not quite here

Mar 31, 2006

#7

• Mar 31, 2006

• #7

a well balanced rotating assembly, heads, cams, and proper valvesprings will do it.

 

03ghoststang

Well-Known Member

Jul 16, 2005

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Los Angeles, California

Mar 31, 2006

#8

• Mar 31, 2006

• #8

what everyone mentioned above but a 4V would get you there faster also how much are you willing to spend for that is a big question....

 

'13_ImpactBlue_GT

Angry Little Elf

Mar 30, 2005

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Where the men are men and the sheep are nervous

Mar 31, 2006

#9

• Mar 31, 2006

• #9

Whats PTVC? Piston to Valve Contact?

 

helty

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Mar 30, 2005

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Mar 31, 2006

#10

• Mar 31, 2006

• #10

Toms_2003_Stang said:

Whats PTVC? Piston to Valve Contact?

Click to expand...

yes

 

T

TGJ

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#11

• Apr 1, 2006

• #11

sgarlic said:

Everything you mentioned is involved, but the main thing keeping us from 7k is the crankshaft.

Click to expand...

No, it is the stock valve train in the heads that prevent a higher RPM limit. Valves float at the higher RPM causing PTV and blown motors. The next issue is the stock pistons and rods.

There is nothing wrong with the stock crankshaft. With proper pistons/rods and a good valve train in the heads, the only thing preventing an even higher RPM is the heads. I know of quite a few cars that are pushing over 7500 RPM on the stock crankshaft with no problems, however these cars do have forged pistons and rods as well as upgraded heads.

Show me an example( Post a link ) of a failed 2V crankshaft where the crankshaft was the problem. I have asked for this at other boards and have yet to see an example of it.

 

QDRHRSE

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Apr 1, 2006

#12

• Apr 1, 2006

• #12

TGJ-

I agree. It's the connecting rods that fail. I've learned a lot about this stuff with my Lightning. The 4.6's actually are a lot stouter than everybody thinks. What kills them is detonation after 400rwhp. People get too aggressive with their tunes, run the too lean, detonate, and then lose a rod. If you keep them rich you can see 500hp with less problems....I didn't say no problems....less.

 

S

stanggt00

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Jul 16, 2003

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baltimore md

Apr 1, 2006

#13

• Apr 1, 2006

• #13

hmm thxs for the input guys

so a forged motor with some camms and heads should do it

question about the 4v is it a direct swap

i mean can i just drop a mark 1 motor in my gt and be happy with out a lot of modifications

 

Stang|ess

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Apr 1, 2006

#14

• Apr 1, 2006

• #14

you don't need a forged block to rev to 7000.

cams, head, and don't forget valve springs. I'm assuming stage 2 cams would be in this application, so don't forget supporting mods such as gears.

 

sgarlic

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Apr 21, 2001

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#15

• Apr 1, 2006

• #15

.. or toilet paper.

 

jstreet0204

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Apr 1, 2006

#16

• Apr 1, 2006

• #16

sgarlic said:

Everything you mentioned is involved, but the main thing keeping us from 7k is the crankshaft.

Click to expand...

KenB on modular depot revs to 7500 with a stock cast crank.
n/a 4v motors have a 6800 redline with the same rods and pistons as the 2v's have as far as I know. So I don't think the bottom end is a problem if the valve springs are strong enough to keep the valves from floating and hitting a piston.