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Stroking it!
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Sweet man! Glad you got it together and all is well. IIRC the compression ratio of the Accurate Power kit is like 9.4:1 or so? That alone will require at least midgrade to ensure no pinging under any circumstances. If it is ok under most circumstances but worse when you short shift it a bit and lug it then octane should solve the problem. Otherwise it could be lean? But I think the 24 lb/hr injectors should be plenty of fuel...
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Thanks for the "teaching" cbremerScarey enough I do understand what boring an engine is, the rest is just way above me now.
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Originally posted by Dukes69Nice work chuck! Maybe try some 91 octane!what did your compression ratio come out to be?
best i can figure is somewhere around 9.4 or 9.5:1. a bit higher than i had hoped, but the machine shop did say that the deck wasn't exactly flat
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Originally posted by cbremerwoohoo! it's done... it runs... the distributor was one tooth off so it knocked and backfired a bit, especially under load. reindexed the dist. and all is wellit's got a very slight ping in 4th gear so i might need to invest in octane booster (or 89 octane gas).
Nice work chuck! Maybe try some 91 octane!what did your compression ratio come out to be?
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woohoo! it's done... it runs... the distributor was one tooth off so it knocked and backfired a bit, especially under load. reindexed the dist. and all is wellit's got a very slight ping in 4th gear so i might need to invest in octane booster (or 89 octane gas).
nagal, in the simplest terms, stroking an engine is a method of rebuilding using non-stock parts to increase the stroke (the distance the piston travels up & down the cylinder). in the case of the Jeep 4.0L, there are several ways to do this, depending on how much you want to spendi used a crankshaft from a 4.2L Jeep engine, 4.0L connecting rods, and custom-made pistons. I also bored the block over a bit, making the diameter of the cylinder a bit larger as well. my engine is now about 4.6L displacement. tons of fun
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This thread has been totally fascinating for me even though I hardly understand itAny good books out there about engines that can help me to at least understand what everyone is talking about?
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well it fired up on the first trythe directions that came with the cam said to run it for 20 minutes... which I did, of course. I haven't taken it for a spin yet since I still have a few minor things to do: bolt down the airbox, connect the ground strap, top off the transmission fluid (lost 4 or 5 quarts when I disco'ed the tranny cooler lines and removed the torque convertor). It starts after turning over 2 or 3 times and runs & revs like nobody's business. Oil pressure is right at 40 PSI cold. I can't wait to take it for a spin tomorrow
Not bad for a first-time engine builder
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Looks nice, you need some help breaking in the cam? I'll hold the throttle open for you. That's the fun part...2,000 rpm for 30 minutes. The neighbors love that, especially if you do it at about midnight or so on a school night without the exhaust hooked up...
This is the pic I was looking for... Now I know for sure what these brackets are for on this junkyard engine I have - I thought they were XJ. I guess I need to keep scouring ebay for a wrangler a/c bracket. Damn I wish I paid more attention to what the heck I buy...
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Boo now we cant race fair. Better hook up the nos........
Looks good Chucky.
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She looks soooo SWEET!!!Wish I could be ther to hear her fire up for the first time!Actually I wish it was in my CJ!
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alrighty then... theis is getting serious
before:
making a little room to work:
OUT WITH YA!
seems to me that something's missing?
much better
finish up the wiring, new radiator & hoses, other odds & ends and (hopefully) firing it up tomorrow
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How about "Yeeee hawww"? Can I say yeee haw instead? I'll take it - heck, i'll even pull it myself.... we'll be in touch.
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Originally posted by rickLooks fast anyways... I think that is the last 4.2L crank core in the US. Napa didn't have one when I first tried to order it (right after you did Chuck), and I have been through 3 places that say "yeah, sure we have one of those..." only to find out after they actually look on the shelf that they are out of them. I have started expanding my search...my father is looking for one in the engine scrap yards of good ole Detroit...
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