300hp stroker possible?

[ROBZ95Xj]

I'm planning on stroking my 4.0 next winter with the accurate power kit and big valve head. Now could it be possible to get 300+HP out of a stroker maybe with a aggressive cam and higher compression?

 

[Goatman]

Sure, all it takes is money.

 

[BLSXJ]

sure just its going to be alot of work.

think complete exhaust system, 6by9 fipk, port and polish the head, basicly you would have to upgrade every thing. but if yo havethe money then gofor it

 

[ROBZ95Xj]

I was thinking Mike Leach header w/full2.5" exsaust, K&N FIPK, 62mm TB, and 99+ intake.

 

[5-90]

It's potentially doable, but hitting 300 pound-feet of torque is easier, and if you are building an off-road engine, you should be more interested in torque anyhow - remember that our engines pretty much live at low RPM - which is where torque is made.

When I wrote my chapter on Strokers, I used a 1989 RENIX 242 as a baseline, and just changed bore & stroke. No head changes, no header changes.

Using a 258 crank (3.895" stroke) and some bore work on the engine, you can get theoretical numbers of 300 pound-feet at 2000-ish RPM with a +.060" bore, and top 300 by boring to an even four inches.

I need to revise the chapter, and now that I've got that thrice-damned English Writing class out of my hair (an egoist instructor - a Liberal to boot! - with a real hobby-horse for the MLA five-paragraph essay. One simply cannot develop complex ideas in only five paragraphs - it takes too much time to make it that short!) Like I said, all I did was bore/stroke changes, without doing anything with head breathing, forced induction, or anything similar. Given time, that chapter is going to get longer (once my new computer comes in...)

5-90

 

[nhrocker]

If you haven't talked to NHxj4x4 yet, you should try to. He's in Keene as well and was finishing up a stroker in his XJ last I knew.

 

[ROBZ95Xj]

If you haven't talked to NHxj4x4 yet, you should try to. He's in Keene as well and was finishing up a stroker in his XJ last I knew.

Yes I have. He said it should be finished in the next few weeks.

 

[rsalemi]

Clifford advertised 350 HP from their stroker - at 6500 RPM!

It should be possible to make 300 pretty easy - but passing emissions or using it as a daily driver probably won't be so easy.

 

[CochinoFilipino]

Anyone know how much HP and/or TQ a 4.0 block can make reliably before it cracks?

 

[casm]

Anyone know how much HP and/or TQ a 4.0 block can make reliably before it cracks?

Also check Dr. Dyno's website - lotsa good info there.

 

[JeepSpeed]

Anyone know how much HP and/or TQ a 4.0 block can make reliably before it cracks?

The block? Sh*t, I bet the block could take 500hp before cracking, as long as temperatures are controlled. That's not the problem, the bottom end, rotating assembley, even top end and head components I would worry about first. Also, you can make a bulletproof engine, but you need to put it in a bulletproof vehicle too. T-case, axles, d-shaft, suspension.....

 

[Dr. Dyno]

I'm planning on stroking my 4.0 next winter with the accurate power kit and big valve head. Now could it be possible to get 300+HP out of a stroker maybe with a aggressive cam and higher compression?

Yeah it's possible but it ain't cheap. Take a look at the 4.9 & 5.0 strokers on this page.
If you're satisfied with 260+hp/320+lbft, copy my stroker instead. It'll cost a lot less and you'll have great torque from 750-5250rpm.

 

[ROBZ95Xj]

What does everyone think of the accurate power kit? I perfer to get a whole kit instead of peacing one together.

 

[Dr. Dyno]

The AP kit is pretty good value for money considering what you get in it.

 

[ROBZ95Xj]

The AP kit is pretty good value for money considering what you get in it.

Thanks for the help

 

[CW]

I went with tha AP kit and have never had a problem. It doesn't cost much more than finding all of the parts yourself and you get those trick pistons. Give them a call and tell them what your goals are for your engine and they will set you up with what you need.

 

[Gil BullyKatz]

Another vote for Mike at Accurate...

VERY knowledgeable when it comes to stroker builds...

Great guy...

Won't try to sell ya something you don't need...

I bought a lot of my Stroker parts from him...

He also answered a million of my questions without making me buy something...

If you're going with a Long Rod... Go with his kit

 

[XJZ]

Yeah it's possible but it ain't cheap. Take a look at the 4.9 & 5.0 strokers on this page.
If you're satisfied with 260+hp/320+lbft, copy my stroker instead. It'll cost a lot less and you'll have great torque from 750-5250rpm.

Dr. Dyno:

What's your thoughts on the '99 and up intake manifold? Do you think it would add a bit the the stroker torque/h.p. numbers?

Also, Hesco just came out with an aluminum head that has great flow characteristics and would certainly add to these numbers. How much I don't know off hand, but sounds like a great head.

tia

 

[ROBZ95Xj]

Dr. Dyno:

What's your thoughts on the '99 and up intake manifold? Do you think it would add a bit the the stroker torque/h.p. numbers?

Also, Hesco just came out with an aluminum head that has great flow characteristics and would certainly add to these numbers. How much I don't know off hand, but sounds like a great head.

tia

the intake is 18hp on paper. The hesco head=to much$$$$$$$$$$$$$$$$$4me

 

[XJZ]

the intake is 18hp on paper. The hesco head=to much$$$$$$$$$$$$$$$$$4me

But that's on paper.....I'm talking real world. How effective is it? 18 h.p. would be great but seems a bit too high. I'm sure it produces more on a modified engine when compared to a stock motor though.

The Hesco head may be a few bucks, but I bet it will beat the pants off any production head, especially if you fully prep it. YEE-HAW!! Plus it's lighter weight; a win-win situation.