B heads rev limiter?

bitemark46 · October 1st, 2009, 10:01 AM

Originally Posted by Boostang

its just a basic 2v to 4v swap.. just trying too see where i need to set my rev limiter for and where these heads will make power.. until i get out of college then these heads will see the 8500 range

What cams are you using? I assume mark8 cams if you are using the whole top end. Mark8 cams with a stock runner length 97 cobra intake will put your peak at or below 6k. If you can find some 96-98 intake cams. These are the most agressive factory intake cams. Then your peak would be around 6200. Shorten the runners on the intake and it'd be around 6400.

Boostang · October 1st, 2009, 02:57 PM

how do i shorten the intake runners?
machine shop?

ReverendDexter · October 1st, 2009, 04:38 PM

Originally Posted by bitemark46

What cams are you using? I assume mark8 cams if you are using the whole top end. Mark8 cams with a stock runner length 97 cobra intake will put your peak at or below 6k. If you can find some 96-98 intake cams. These are the most agressive factory intake cams. Then your peak would be around 6200. Shorten the runners on the intake and it'd be around 6400.

Hey Mark - wouldn't a stock '96-98 cobra intake with stock '96-'98 Cobra cams make peak power about the same place as a stock '96-98 Cobra, i.e. ~5800 rpm? What's pushing the peak power up the rev range?

Boostang · October 1st, 2009, 04:56 PM

thats what i was thinkink but like i said i know nothing about the 4v motors

bitemark46 · October 1st, 2009, 05:24 PM

Originally Posted by ReverendDexter

Hey Mark - wouldn't a stock '96-98 cobra intake with stock '96-'98 Cobra cams make peak power about the same place as a stock '96-98 Cobra, i.e. ~5800 rpm? What's pushing the peak power up the rev range?

Before my shortrunner intake my car peaked at 6200. This is a full bolt-on car. So maybe a completely stock intake/exhausted car would peak lower but typically from the dyno's I've see it was between 6000-6200. By shortening my runners I raised peak to 6400.

Boostang- To shorten the runners you have to remove the runners and lop between 1-2" off the ends and epoxy them back in. Gains are between 12-20rwhp. It can be done for relatively cheap. Just all depends if you're mechanically inclinded.

-Mark

Boostang · October 1st, 2009, 05:34 PM

im mech inclined... ive just never had to do machine work before..

98Cobra_sleeper · October 1st, 2009, 06:10 PM

SHM will port a cobra intake for 700bucks, and it will guarantee to see a 50hp gain, buuut you kinda need boost for that kinda flow.

Boostang · October 1st, 2009, 06:17 PM

im not looking to pay 700 bucks for an intake port right now.. maybe itll be worth it when i get some boost flowing thru it

98Cobra_sleeper · October 1st, 2009, 06:19 PM

yeah, im keepin the stocker. im not worried about makin my car a "race" car until i damage the body somehow. then i'll dig into things and make it a racer.

Boostang · October 1st, 2009, 06:35 PM

im just trying to find a 98 cobra intake!

98Cobra_sleeper · October 2nd, 2009, 12:46 AM

i did see them frequently on ebay.

October 1st, 2009, 06:10 PM	#27
98Cobra_sleeper Enthusiast 1998 mustang cobra Join Date: Jul 2009 Location: pa Posts: 617 iTrader: 0 reviews	SHM will port a cobra intake for 700bucks, and it will guarantee to see a 50hp gain, buuut you kinda need boost for that kinda flow. __________________ HP twin turbo - 691hp/608tq with 15lbs huffed in (old setup) comin soon...ON3 turbo kit, PTE7175

October 1st, 2009, 06:19 PM	#29
98Cobra_sleeper Enthusiast 1998 mustang cobra Join Date: Jul 2009 Location: pa Posts: 617 iTrader: 0 reviews	yeah, im keepin the stocker. im not worried about makin my car a "race" car until i damage the body somehow. then i'll dig into things and make it a racer. __________________ HP twin turbo - 691hp/608tq with 15lbs huffed in (old setup) comin soon...ON3 turbo kit, PTE7175

October 2nd, 2009, 12:46 AM	#31
98Cobra_sleeper Enthusiast 1998 mustang cobra Join Date: Jul 2009 Location: pa Posts: 617 iTrader: 0 reviews	i did see them frequently on ebay. __________________ HP twin turbo - 691hp/608tq with 15lbs huffed in (old setup) comin soon...ON3 turbo kit, PTE7175

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October 1st, 2009, 02:57 PM	#22
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	how do i shorten the intake runners? machine shop?

October 1st, 2009, 04:56 PM	#24
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	thats what i was thinkink but like i said i know nothing about the 4v motors

October 1st, 2009, 05:34 PM	#26
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	im mech inclined... ive just never had to do machine work before..

October 1st, 2009, 06:17 PM	#28
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	im not looking to pay 700 bucks for an intake port right now.. maybe itll be worth it when i get some boost flowing thru it

October 1st, 2009, 06:35 PM	#30
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,747 iTrader: 0 reviews	im just trying to find a 98 cobra intake!

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