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4.8 stroker build

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GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

4.8 stroker build

Post by GreenYJ » October 27th, 2016, 5:41 pm

I'm building a stoker for my '94 YJ. I've owned it since '96 and put 180,000 of it's 182,000 miles on it. The original 4.0 has gotten pretty weak. So on to the stroker build!
I've been gathering parts for at least 12 years, probably longer...ha ha!

12 cw 258 crankshaft. Turned .010 .010
Eagle h-beam rods 6.150" long (had these a while)
Camcraft custom camshaft
Yella terra non-adjustable 1.7 rockers
ARP main studs
ARP head studs
Ferrea LS1 valves
Edelbrock 4.0 bare aluminum head
4.000" SRP dished pistons (yes, I'm going .125" over)
Cometic 4.060" bore .051 mls head gasket
Both early & late efi intakes

On a side note, I have access to a dyno and would like to test the 2 intakes to see what the actual difference is, if any. I would think obd1 from the boneyard would be the easiest way to do that. I could also test stock shorty against long tube pacesetter too.

That's all I can think of at the moment. I'll get some pictures and post them later.

Roger
1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » October 27th, 2016, 8:13 pm

20161027_175254.jpg
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20161027_174340.jpg
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1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » October 27th, 2016, 8:17 pm

20161027_174658.jpg
20161027_174237.jpg
20161027_174113.jpg
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1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » October 27th, 2016, 8:25 pm

20161027_175504.jpg
20161027_174907.jpg
20161027_174850.jpg
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1994 Sahara YJ

Russ Pottenger
I love JeepStrokers.com!!
I love JeepStrokers.com!!
Posts: 723
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: 4.8 stroker build

Post by Russ Pottenger » October 31st, 2016, 3:06 pm

What are you shooting for a static compression ratio?
It looks like it's gonna be pretty low.

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » October 31st, 2016, 7:11 pm

I'm figuring around 9.8:1. It's my DD so I'm hoping to run on regular gas. I think the aluminum head will help towards that. The piston is for a sbchevy and has a 31cc dish with a 1.425" compression height. I plan to cut around .050 off of the top to fit my application. That should drop the dish to around 25cc.
1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » November 14th, 2016, 7:01 pm

And the rest of the parts arrived. I guess it's time to get cracking!
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1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » November 14th, 2016, 7:13 pm

I bought one of these so I can still run it on the dyno even if I don't find an obd1 engine harness.
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1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » November 30th, 2016, 7:51 pm

And one nasty '93 block. It ended up sonic testing thicker than the '97 & '98 blocks I have.
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1994 Sahara YJ

Russ Pottenger
I love JeepStrokers.com!!
I love JeepStrokers.com!!
Posts: 723
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: 4.8 stroker build

Post by Russ Pottenger » December 3rd, 2016, 9:57 am

Can you post up your sonic test sheet with the numbers that you came up with?

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » December 3rd, 2016, 7:56 pm

Sure. They're at work so it'll be Monday night.
1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » December 5th, 2016, 8:24 pm

The '97 & '98 are short blocks that I ran #1(and #6) to BDC to do quick check to determine if either was worth disassembling for my purposes. All 3 blocks seem to taper to a thinner area 2/3rds of the way down.
1998 std bore
#1 .200 .220
#6 .183 .230
1997 Jasper .030 over
#1 .205 .205
#6 .205 .230
I actually checked the '93 block first and since the '97 & '98 blocks came up thinner, I didn't bother with the rest of the cylinders.
1993 std bore
#1 .220 .230
#2 .210 .235
#3 .220 .230
#4 .230 .220
#5 .210 .240
#6 .210 .240
I couldn't figure out how to draw circles to write around.
1994 Sahara YJ

Russ Pottenger
I love JeepStrokers.com!!
I love JeepStrokers.com!!
Posts: 723
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: 4.8 stroker build

Post by Russ Pottenger » December 6th, 2016, 10:36 am

Your numbers coincide with what I typically come up with.

Thanks for sharing!

Russ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » March 16th, 2017, 4:12 pm

I acquired an LM-1 this week along with a remote display gauge. Apparently it has analog outputs that can be programmed to mimic narrow band O2 sensor. I'm hoping to make this work in my YJ with the new stroker.
20170316_182911.jpg
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1994 Sahara YJ

GreenYJ
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: October 21st, 2016, 2:02 pm
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.8 stroker build

Post by GreenYJ » June 21st, 2018, 6:49 pm

Been a while since I posted any updates. Everything had been on hold, family stuff, health issues, life in general...
Block has been bored .120" over to 3.995". Still need to hone to size. Pistons and rods have been pin fitted. Turns out Eagle rods have a Ford pin diameter (.912") and my pistons have sbc pins (.927"). Big end of the rods are on the high end of the specs.
20180621_141732.jpg
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1994 Sahara YJ

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