Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 06-30-2012, 10:57 AM   #11
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Quote:
Originally Posted by rr41mag View Post
We get alot of returns on those cheap blister packs electric fuel pumps.
By "blister pack" I take it you mean the Mr. Gasket? That's the input I'm looking for on these. I wonder how many of your returns are due to them not being mounted in the right location or people running them dry to many times? I'm leaning towards going with a Holley or Carter.

Thanks

 

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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 06-30-2012, 01:02 PM   #12
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Quote:
Originally Posted by Rescue Diver View Post
By "blister pack" I take it you mean the Mr. Gasket? That's the input I'm looking for on these. I wonder how many of your returns are due to them not being mounted in the right location or people running them dry to many times? I'm leaning towards going with a Holley or Carter.

Thanks
I have heard many good things about the Holley pump. Me personally I have the Carter pump. I like it and have had several of them and will be installing it on my CJ
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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-01-2012, 02:03 AM   #13
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Picked up the 4.0 today.
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img459-1-.jpg   img462-1-.jpg  

 

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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-01-2012, 09:23 AM   #14
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The mister gasket, actually now that I think about it, it seems it's mostly the one people get for deasel

 

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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-01-2012, 10:23 AM   #15
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On the subject of fuel pumps.

When and if I decide to go with EFI I have a plan to modify the original tank to accommodate the XJ in tank pump and sending unit. The plan includes putting the sending unit centered in the access hole in the bed. This will, more than likely require an after market fuel gauge.
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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-01-2012, 10:46 AM   #16
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How many miles does I have on it?

 

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Old 07-01-2012, 11:29 PM   #17
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That looks new, what did it set you back. details man details

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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-02-2012, 12:02 AM   #18
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Quote:
Originally Posted by Rescue Diver View Post
Let's try this again. In this thread, I would like to share what I'm doing, and get input from others specifically pertaining to ways to build 4.6 and 4.7 liter Inline 6 stroker motors.

I decided to pull the trigger on starting my stroker motor project. I'm picking up a good 1995 4.0 donor motor today or tomorrow, and over time I will pick up new Sealed Power dished pistons that should give me roughly 9.25 to 1 compression, getting the block bored either 30 or 60 over, and I'll be using the crank out of my 258 machined 10 under to clean it up.

My plan is to do a cheap but solid build using my 258 crank and rods, the 4.0 block and new pistons, and the stock 4.0 high output cam and lifters. I already have a killer 4.0 head that I'm currently using on my 258, but I also plan to continue using my HEI distributor and MC2100 carb instead of going the fuel injection rout that most do. Unless it shows signs of wear, I think I'll also be re-using the tru roller timing chan I already have in the 258. It only has 25k on it, so I expect to find it still in good shape. I guess I better check to make sure the 4.0 and the 258 take the same chain and gears?

What I've confirmed so far is that the bell housing bolt pattern is the same between the 258 and 4.0. The distributor will also fit. There is a little question on the motor mounts though. From what I gather, the later model 4.0's (TJ's maybe) require a little grinding on the block to get the CJ mounts to clear, but I don't know for sure what year in the 4.0 production that this change occurred. Any input on this would be welcome!

I also discovered that there's a slightly different part number for the oil pump. The 4.0 pump is the same number as the 258 pump but with an "A" on the end. Does anyone know if they're interchangeable? The motor I'm buying is complete, so I'll probably switch to the serpentine belt settup. I've read that I'll need to use some kind of spacer to mount the 4.0 serpentine's harmonic balancer to the 258 crank.

The last issue that I can think of to tackle is the fuel pump. Since the 4.0 was built for fuel injection, it won't take a mechanical pump, so I'll have to switch to electric. That goes against my "Keep it simple stupid" philosophy, but I have no other choice. I'm thinking of using a Mr. Gasket Micro electric 4-7 PSI pump with no regulator, and mounting on the inside of the right rear bump stop extention to keep it level with the bottom of the gas tank. Does anyone on here have any experience with these pumps? Should I carry a spare so I don't get stranded???

I think I covered all the bases. Did I miss anything????

Thanks for any input!
David

I say go as low as you can when boring, in case you need to go higher later or keep the engine long term and need to do again.

I am not sure about the oil pump with the "A" but I do know the 258 actually had a couple oil pumps that were different because the screen faced a different direction, basically the drop in the oil pan was either at the center or to the rear. Not sure how that works on the 4.0 but just thought I should mention.
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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-02-2012, 07:57 AM   #19
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Around '99 they made some internal engine changes that dropped the output. The new intake brought it back to the previous levels. Swapping the late intake on an earlier 4.0 gives you from 12 to almost 20 horespower at the flywheel depending on who you believe. Depending on the year of the donor you have to swap some accessory brackets as well. To really see the jump you need both the correct regulator for the fuel rail and higher flow injectors. The donor intake can come from an Grand as well.

 

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Default Re: Thread exclusively to discuss the best ways to build Jeep I6 Stroker motors 

Old 07-02-2012, 11:52 AM   #20
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Here's one answer to the question of performance gains you get with the stroker.

Stroker

 

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