New Stroker recipe

[Cheromaniac]

Ford rated their 24lb injectors at a 39psi fuel pressure whereas Accel rated their 24lb injectors at 43.5psi. At the 49psi fuel pressure of the '96-'04 system, the Ford injectors would flow 25.9lb/hr whereas the Accels flow 25.5. Not much of a difference so pick your poison.

[DonS]

If you want to really keep things simple and low cost while having newly bored cylinders, you could do the modified "poor man's":

4.6L modified "poor man's" stroker

Jeep 4.2L 3.895" stroke crank
Jeep 4.0L 6.125" rods
Keith Black UEM-IC944-020 pistons
9.25:1 CR
Stock 4.0 HO camshaft
Ported HO 1.91"/1.50" cylinder head
Mopar/Victor 0.043" head gasket
0.070" quench height
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines, Accel 24lb/hr injectors with stock 49psi FPR for '96 and later engines

The only non-stock parts you'll need are the 258 crank, IC944 pistons, and Accel 24lb injectors.

How about if it is an old Renix? I need to rebuild my '88 XJ 4.0L, it has just over 407k miles and the compression is low. I'm considering a stroker build, but want to stay 87 octane, minimize cost, and minimize down time.

Would the above recipe work if we changed from HO to Renix?

[Muad'Dib]

If you want to really keep things simple and low cost while having newly bored cylinders, you could do the modified "poor man's":

4.6L modified "poor man's" stroker

Jeep 4.2L 3.895" stroke crank
Jeep 4.0L 6.125" rods
Keith Black UEM-IC944-020 pistons
9.25:1 CR
Stock 4.0 HO camshaft
Ported HO 1.91"/1.50" cylinder head
Mopar/Victor 0.043" head gasket
0.070" quench height
Ford 24lb/hr injectors with stock 39psi FPR for '87-'95 engines, Accel 24lb/hr injectors with stock 49psi FPR for '96 and later engines

The only non-stock parts you'll need are the 258 crank, IC944 pistons, and Accel 24lb injectors.

How about if it is an old Renix? I need to rebuild my '88 XJ 4.0L, it has just over 407k miles and the compression is low. I'm considering a stroker build, but want to stay 87 octane, minimize cost, and minimize down time.

Would the above recipe work if we changed from HO to Renix?

Yes... but then again it would be worthwhile to at least do a changeover to a HO head. Check my build thread for more info.

[DonS]

Yes... but then again it would be worthwhile to at least do a changeover to a HO head. Check my build thread for more info.

In the Stroker Basics forum?

[Muad'Dib]

We have a section called "Projects" that contains individual build threads.

Here is a direct link to mine;

http://www.jeepstrokers.com/forum/viewt ... f=8&t=2317

[Cheromaniac]

How about if it is an old Renix? I need to rebuild my '88 XJ 4.0L, it has just over 407k miles and the compression is low. I'm considering a stroker build, but want to stay 87 octane, minimize cost, and minimize down time.

Would the above recipe work if we changed from HO to Renix?

Yeah, it would still work but produce less HP. If you're strapped for cash and want to build the engine quickly so you can get the Jeep back on the road, just do the basic stroker rebuild. You can always swap the HO stuff ('91-'95 head, '99+ intake, '97+ PS pump/bracket, '91-'95 injector rail with supply/return fuel lines, '91-'95 TB) later on as your budget allows.

[stroked'73]

The renix engine only produced something like 7 hp less and the torque was pretty much the same as an HO. I built a renix stroker because the engine was given to me, and I've been pretty happy with it. I ported the head a bit, got a valve job and called it good. If every bit of hp is important then the HO head is your ticket, otherwise the renix head will be just fine - and it's free!

[Jeepinscott]

I agree with running the renix. A few Jeepspeed racers, including the founder and some recent class winners run renix motors with renix heads and have had good luck. The Blocks are as good or better than the NVH blocks and they can be stroked and massaged to make great power. A 400k motor that has not come apart should be seasoned better than anything new.