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JJH

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  1. Thank you Moses. I should have thought of the volume measurement myself! I'll attempt the pipe cleaner through the sparkplug hole, then the liquid method if in doubt. I will, however, be needing a new throw-out bearing very soon, so dropping the oil pan will not add all that much effort when the time comes. Ironically, I am in the process of building a stroker for a CJ (that you advised my on in another forum). Not having driven a stroker yet, I am enthused by what I am experiencing. Even more so if this turns out to be a 4.0L and I have more power to look forward too in a 4.6L This is the first XJ I have owned and am loving it right away. One of my favorite vehicles is a 2nd Gen Toyota 4Runner with 22RE and manual transmission. The XJ is very reminiscent of the Toyota, but thankfully more simple (and cheap!). I have owned several CJ's and now wish I had tried the XJ out sooner. I do have a 252H cam purchased years ago before production stopped. At some point I expect I'll get into this engine and use the cam if it does not have a performance cam already. Thank you again. JJH
  2. Hello Moses, I’ve just acquired a 1991 XJ Cherokee with 4.0L, AX15, 3.07 axle gears. The seller knew virtually nothing about the truck, and only had it for a couple months before deciding it was not for him. It is in remarkable mechanical shape for the 200,000+ miles on the odometer, relatively new 4” lift and brand new 31x10.50r15 tires. I have limited driving experience with the 4.0L, except for a 1990 Renix version with automatic transmission that was quite sluggish in its stock form. This new acquisition can put you back in your seat from off idle, and has more power than I would expect. The somewhat clean engine (little oil leaks for 31 years old), the 24lb Mopar injectors, and a few other details makes me believe the engine is not original, or a least modified. My question then is how can I identify whether this engine could be a stroker without dropping the oil pan to examine the crank? I suppose I could try to measure the extra ~1/2” of piston stoke through the spark plug hole…any other ideas that would not require significant disassembly? Instead of a stroker, could an aftermarket cam provide this performance on a stock 4.0L? The engine idles very smooth, and the EFI seems to be compatible with whatever cam it has. I suspect a stroker due to your past comments of unsatisfactory performance for such axle gearing and tire combinations as I have here. The prevailing advice would be to seek 3.72-4.10 gearing for this combination, but it performs very well as it is. Thank You JJH
  3. Moses, Yes, I plan to use the comp cam 68-232-4 (https://www.compcams.com/xtreme-4x4-206-212-hydraulic-flat-cam-for-amc-199-258-4-0l.html). I'm aware of your advocacy of the 252 grind. In the absence of obtaining that grind, the 68-232-4 has had positive reviews, provides a bit more lift, is purported to be efi friendly, and good for the 800-4800 rpm range. Your thoughts would be welcome. Since I did not set out to build a stroker, I acquired new 12 hole upgrade injectors rated at 240 cc (not sure of the pressure rating, but probably less that 24lbs). I expect I will give them a try and then upgrade to 24lbs injectors if necessary. I do have an adjustable fuel pressure regulator for fine tuning. The rest of the jeep is as follows: 1984 cj7, AX15 Trans, D44 full float rear, D30 front, ARBs, 4.27 gears, 33x10.50r15 tires. I don't expect travel speed to ever be more than 55-65 mph travel speed, so it should spend most of its time below 2200-2300rpm. We live 10 miles out of town and 55mph is plenty of speed to get us there. JJH
  4. Moses, I have a complete 4.0L, MPFI, and AX15 from a 1991 Cherokee. My intension was a transmission swap in place of the T176, a rebuilt 4.0L head and the MPFI from the doner engine onto the original AMC 258. Midway I discovered my doner was not a 250,000 mile engine, but was in fact freshly rebuilt. A 4.0L swap then became in order. I then discovered hopelessly damaged keyways on the 4.0L crank. Since the 4.0L block needed little more than a hot tank and a light hone, and needed a new crank anyways, I decided to combine my existing components into a stroker. I am doing the long rod version with the 4.0L rods and custom pistons. The crank is from the existing AMC 258. All of this is going into a 1984 CJ7. JJH
  5. Moses, Thank you for your very detailed reply. You left no question unanswered. A high volume pump has been ordered and will be used in my engine build. And thank you for providing such a wealth of technical info in so many other areas. It has been a great resource for me over the years. JJH
  6. In putting together a jeep stroker build, I have a question regarding oil pump selection. I see Moses using high volume oil pumps in engine builds in his books and in the materials presented here. My intention was to use one until I found several references from Melling and anecdotal that high volume may cause issues with a fresh build. The reason being that tight bearing clearances on a fresh build could be over taxed by the added pressure. Some folks mentioned their engine builder would not warranty an engine with a high volume pump. Moses and Tony Hewes both referred to using high volume Melling pumps in jeep strokers. So , what are the thoughts on these opposing positions? Thanks! JJH
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