Power power power
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Really you should have just made a cheap man stroker while it was out!
Here is all you need for a 4.5L poor man stroker and the power #'s at the bottom are from a guy's that have it I didn't just make it up.I swear
Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Sealed Power 677CP standard bore pistons
9.2:1 CR
Stock 4.0 camshaft
Ported HO 1.91"/1.50" cylinder head
Mopar/Victor 0.043" head gasket
0.088" quench height
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines, stock injectors with stock 49psi FPR for '96 and later engines
247hp @ 4900rpm, 300lbft @ 3500rpm
Here is all you need for a 4.5L poor man stroker and the power #'s at the bottom are from a guy's that have it I didn't just make it up.I swear
Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Sealed Power 677CP standard bore pistons
9.2:1 CR
Stock 4.0 camshaft
Ported HO 1.91"/1.50" cylinder head
Mopar/Victor 0.043" head gasket
0.088" quench height
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines, stock injectors with stock 49psi FPR for '96 and later engines
247hp @ 4900rpm, 300lbft @ 3500rpm
CF Veteran
Joined: Feb 2009
Posts: 1,184
Likes: 4
From: Ohio
Year: 1992
Model: Cherokee
Engine: 1995 ZJ 4.0
Do you have a place with a dyno near you? Around here we have A LOT of street/strip cars, drag cars, and stock cars so I know a place that will do it for $55 for 2 pulls and $75 for 3. But, most places were there are not a lot of dyno's around charge double even triple that. Sometimes they will even have a dyno day and charge even less like$20 a pull ETC...
Last edited by bigbadxj; May 6, 2009 at 05:48 PM.
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Will do but I must add this, pre chip, intake, throttle body spacer and exhuast the XJ would not break the 33" MT's free on pavement. Post installation was a totally different story, stomping on the gas would tear them free with no trouble. As I'm not an engineer I can't say what's actually gained but what I can say is that I gained enough power to do what wasn't possible before hand. If that's what you get with 5hp then I want no more. I built this thing to run trails, not quarter miles ha ha.
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Do you have a place with a dyno near you? Around here we have A LOT of street/strip cars, drag cars, and stock cars so I know a place that will do it for $55 for 2 pulls and $75 for 3. But, most places were there are not a lot of dyno's around charge double even triple that.
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
Will do but I must add this, pre chip, intake, throttle body spacer and exhuast the XJ would not break the 33" MT's free on pavement. Post installation was a totally different story, stomping on the gas would tear them free with no trouble. As I'm not an engineer I can't say what's actually gained but what I can say is that I gained enough power to do what wasn't possible before hand. If that's what you get with 5hp then I want no more. I built this thing to run trails, not quarter miles ha ha.
whats the part number for the chip you have
CF Veteran
Joined: Feb 2009
Posts: 1,184
Likes: 4
From: Ohio
Year: 1992
Model: Cherokee
Engine: 1995 ZJ 4.0
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
thats 28 %
Seasoned Member
Joined: Dec 2008
Posts: 404
Likes: 0
From: Port Coquitlam, BC, Canada
Year: Sold my 1991 to go to school for 2 years.
Model: Cherokee
Engine: 4.0L
Theirs was bagged though. So much so that on the 3 runs they did they lost something rediculous like 10 hp a pull. There was so much of a difference they couldn't get a real average. If they had kept romping on it it would've died on the dyno. They were also doing it in 4hi (on a 4 wheel dyno) so there's tons of parasitic loss.
CF Veteran
Joined: Dec 2008
Posts: 1,533
Likes: 0
From: eaton ohio
Year: 93
Model: Cherokee
Engine: 4.0
Will do but I must add this, pre chip, intake, throttle body spacer and exhuast the XJ would not break the 33" MT's free on pavement. Post installation was a totally different story, stomping on the gas would tear them free with no trouble. As I'm not an engineer I can't say what's actually gained but what I can say is that I gained enough power to do what wasn't possible before hand. If that's what you get with 5hp then I want no more. I built this thing to run trails, not quarter miles ha ha.
did you regear your axles at all?
Thread Starter
Member
Joined: May 2009
Posts: 111
Likes: 0
Year: 2003
Model: Grand Cherokee
Engine: 4.7L H.O
Theirs was bagged though. So much so that on the 3 runs they did they lost something rediculous like 10 hp a pull. There was so much of a difference they couldn't get a real average. If they had kept romping on it it would've died on the dyno. They were also doing it in 4hi (on a 4 wheel dyno) so there's tons of parasitic loss.
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
Theirs was bagged though. So much so that on the 3 runs they did they lost something rediculous like 10 hp a pull. There was so much of a difference they couldn't get a real average. If they had kept romping on it it would've died on the dyno. They were also doing it in 4hi (on a 4 wheel dyno) so there's tons of parasitic loss.
if they had 36" and3.55 gears and an auto trany
