Mark VIII engine question

mtw002 · September 30th, 2010, 01:40 PM

So I dropped the 460 82 fox build to stuff a 95 mark VIII 4.6 in it instead. I'm trying to figure what gears to run right now. I'll be using the 4R70w that came with the markVIII. My question is, On a stock 4.6 dohc what rpm do they stop making power? The engine is going to be stock for a while w/only full exhaust.

Thanks.

JC316 · September 30th, 2010, 09:29 PM

Peak power usually arrives at 5500RPM and peak torque at around 4800RPM. You really have to spin these suckers. Run a 4.10 gear minimum. Are you going to be running the Mark VIII computer?

dcook_14 · September 30th, 2010, 09:42 PM

The B heads on the Mark VIII really like high rpms

LGHTNG02GT · September 30th, 2010, 10:11 PM

you get the most power out of the B heads revving the piss out of them, the problem in the Mark VIII's are the cams. they arent as aggressive as the 96-98 Cobra's and i believe will make the most power down a little lower. i know my Mark VIII motor untuned in my car does make GREAT power from 3000rpm up until redline (6000rpm) when i ahve my car dyno'd (hopefully by the spring) i will post the graphs.

JC316 · October 1st, 2010, 02:34 AM

Originally Posted by LGHTNG02GT

you get the most power out of the B heads revving the piss out of them, the problem in the Mark VIII's are the cams. they arent as aggressive as the 96-98 Cobra's and i believe will make the most power down a little lower. i know my Mark VIII motor untuned in my car does make GREAT power from 3000rpm up until redline (6000rpm) when i ahve my car dyno'd (hopefully by the spring) i will post the graphs.

Yeah, when I did my Mark VIII swap in my 96, same thing. Sucker comes alive above 3K RPM. My 3.27 gears and lack of IMRC's really killed the low end torque.

My sister has a 96 Mark VIII with functioning IMRC's and it has plenty of power below 3K, even with the 3.08 gears.

mtw002 · October 1st, 2010, 09:22 AM

Originally Posted by JC316

Peak power usually arrives at 5500RPM and peak torque at around 4800RPM. You really have to spin these suckers. Run a 4.10 gear minimum. Are you going to be running the Mark VIII computer?

Its going to be as stock as stock can be minus LT headers. I'll be running the mark ecu and harness, well both ecu's. I was trying to decide between 4.10's and 4.30 gears. Leaning more toward the 4.10s now. Then Spraying 100shot of nitrous. The engine has 90k on it.

Tang Stang · October 1st, 2010, 10:35 AM

Another vote for 4.10's.

LGHTNG02GT · October 2nd, 2010, 02:35 AM

Originally Posted by JC316

Yeah, when I did my Mark VIII swap in my 96, same thing. Sucker comes alive above 3K RPM. My 3.27 gears and lack of IMRC's really killed the low end torque.

My sister has a 96 Mark VIII with functioning IMRC's and it has plenty of power below 3K, even with the 3.08 gears.

yes sir, i agree. it feels about the same as my 2v down lower in the rpm's. when i have it tuned im gonna have a bit of timing added (just a few degrees so i can still be Nitrous-Safe) to help with the lack of IMRC's and then the 4.10 gears should help out alot with that too. looking back on it, i'm thinking i maybe should have looked around a bit more for a set of 4.30 gears because i am having the redline moved up to 7,000 rpm on this motor.

majorownage · October 2nd, 2010, 03:16 AM

4.10's and please don't run nitrous on a stock block and window it

=D

JC316 · October 2nd, 2010, 04:52 PM

Originally Posted by mtw002

Its going to be as stock as stock can be minus LT headers. I'll be running the mark ecu and harness, well both ecu's. I was trying to decide between 4.10's and 4.30 gears. Leaning more toward the 4.10s now. Then Spraying 100shot of nitrous. The engine has 90k on it.

4.10's are good. One guy with a 96 Mark VIII LSC got into 13's with just a 4.10 gear. Great that you are running the Mark VIII ECU, you will be able to keep the IMRC's.

Originally Posted by LGHTNG02GT

yes sir, i agree. it feels about the same as my 2v down lower in the rpm's. when i have it tuned im gonna have a bit of timing added (just a few degrees so i can still be Nitrous-Safe) to help with the lack of IMRC's and then the 4.10 gears should help out alot with that too. looking back on it, i'm thinking i maybe should have looked around a bit more for a set of 4.30 gears because i am having the redline moved up to 7,000 rpm on this motor.

Nice! I would get a Mach 1 or a Cobra Harmonic balancer for spinning that high, but the motor should do it.

Originally Posted by majorownage

4.10's and please don't run nitrous on a stock block and window it

=D

Stock block can take a 100 shot just fine.

September 30th, 2010, 01:40 PM	#1
mtw002 Enthusiast 2003 vert gt 12.703@ 107.65 KCIR Join Date: Oct 2006 Location: Colorado Springs CO Posts: 662 iTrader: 0 reviews	Mark VIII engine question So I dropped the 460 82 fox build to stuff a 95 mark VIII 4.6 in it instead. I'm trying to figure what gears to run right now. I'll be using the 4R70w that came with the markVIII. My question is, On a stock 4.6 dohc what rpm do they stop making power? The engine is going to be stock for a while w/only full exhaust. Thanks. __________________ Cars Dont Power The Front Wheels, They Lift Them 4v teksid block w/2v heads FINISHED 14 April 2010 2003 vert gt 2v teskid build 12.7 @ 107 (SOLD) 1989 mustang lx

September 30th, 2010, 09:29 PM	#2
JC316 Regular 1970 Mercury Cougar. Join Date: Nov 2009 Location: DFW, TX Posts: 210 iTrader: 0 reviews	Peak power usually arrives at 5500RPM and peak torque at around 4800RPM. You really have to spin these suckers. Run a 4.10 gear minimum. Are you going to be running the Mark VIII computer? __________________ 1970 Cougar.

September 30th, 2010, 09:42 PM	#3
dcook_14 Banned 2004 Mustang GT 12.35@114.08 w/ 1.88 60' Join Date: Feb 2009 Location: Waterloo, IA Posts: 7,015 Blog Entries: 2 iTrader: 7 reviews	The B heads on the Mark VIII really like high rpms __________________ Do the Right Thing, Cook. ~Zip.

September 30th, 2010, 10:11 PM	#4
LGHTNG02GT Hardcore Enthusiast 4V swapped '02 GT (2v) 13.9@101 Join Date: Apr 2009 Location: H~Town, PA Posts: 1,756 iTrader: 10 reviews	you get the most power out of the B heads revving the piss out of them, the problem in the Mark VIII's are the cams. they arent as aggressive as the 96-98 Cobra's and i believe will make the most power down a little lower. i know my Mark VIII motor untuned in my car does make GREAT power from 3000rpm up until redline (6000rpm) when i ahve my car dyno'd (hopefully by the spring) i will post the graphs. __________________ BSD 100MPH Club YMR #8975 4v Swap and a little Purple Bottle MM Nitrous Club #7 MM Cobra Club #87

October 1st, 2010, 10:35 AM	#7
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,960 iTrader: 2 reviews	Another vote for 4.10's. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

October 2nd, 2010, 03:16 AM	#9
majorownage Regular Join Date: Jun 2010 Posts: 424 iTrader: 0 reviews	4.10's and please don't run nitrous on a stock block and window it =D __________________ 1998 Gt full pi swap -Dead and gone 1998 Mark VIII 4.30s, 125 shot, 93 d/s-Daily Driver 1998 BAB Cobra-Project

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