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Post by landbarge on Feb 18, 2022 7:51:07 GMT -8
Those were great cars. At one point in time we had 2 wagons. Wife had the 82 Limited and I had the 80 Sport. The 80 was better geared with the 3 series. Wife's had the sorrowful 2 series. I couldn't find a 4 cylinder model to snag the 3.54"s from. As with most winter driven cars, the body was taken over by the rust belt steel eating termites.
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Post by spud on Feb 27, 2022 7:30:10 GMT -8
Its surprising how much gearing affects a cars personality. Even small changes are dramatic. Its to easy to go big and overgear a car.
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Post by stickshifter on Aug 2, 2023 4:49:33 GMT -8
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Post by spud on Aug 2, 2023 4:51:32 GMT -8
What crank rods pistons did you use? Looks like an earlier block. Good for cam choice with the earlier cams. What cam? I have most of the parts for a stroker 4.0 i intend on assembling soon. Did you have it balanced? Do you think balancing is nessesary with a stroker 6? I bought a scat crank and rods. It looks like a lightweight crank with minimal counterweighting, Not sure if thats worth anything in a stroker 6. Great topic, as you can see i am curious with many questions.
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Post by stickshifter on Aug 3, 2023 4:30:25 GMT -8
"What crank rods pistons did you use? Looks like an earlier block. Good for cam choice with the earlier cams. What cam? I have most of the parts for a stroker 4.0 i intend on assembling soon. Did you have it balanced? Do you think balancing is nessesary with a stroker 6? I bought a scat crank and rods. It looks like a lightweight crank with minimal counterweighting, Not sure if thats worth anything in a stroker 6. Great topic, as you can see i am curious with many questions."
The block is known as an NVH(Noise, Vibration, Harshness) block. It has some extra webbing in it and reportedly the stronger block. Is has NVH cast right in the side so it's easy to identify. I believe this one is from 1998.
The crank is from a pre-82 258 because it has 12 counter weights and is supposed to be the strongest OEM crank(Thanks Rick). My buddy offset ground the crank to 2.000" journals and a stroke of 3.930". The stroke was picked to work with the block deck height, rod length, piston compression height, and desired compression ratio.
The rods are high dollar "6 Lentz 6.125" I-Beam 2.00" Small Journal Billet Connecting Rods with 3/8 Bolts" from ebay for $175. I think they will handle the power and engine speed. The pistons have a .931" pin bore so I had the rod pin bores honed to size. The pistons are set with locks so running full floating works out well. And I used my rod spacers on the crank so I hope that works out.
The pistons are D.S.S. FX-Series Forged 4032 Alloy Pistons 1-6673-3905 Piston Set, 4.7 Jeep 6 Cyl. 1-FX Series -21cc Jeep Dish Top Piston Set. 3.905 bore. They were $550. Not cheap by nice and worked with the combo. The combo leads to a 9.4 compression ratio.
The cam is pretty healthy for the package: COMP Cams Xtreme Energy 4x4 Cam and Lifter Kits CL68-231-4 Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 250/258, Lift .462/.485, AMC, Jeep, L6, Kit
I did a couple hours of easy port work on the head(casting # 0630), nothing fancy, just blending and getting rid of the casting issues. Then I used stainless valves, intake going to 2.000". I cut down the new intake valves in the lathe: AFR Replacement Stainless Steel Valves 7251-1 Valve, Intake, Stainless Steel, 2.020 in. Diameter, 8mm Stem, 4.900 in. Length, Chevy, Ford. The exhaust stayed stock size: AFR Replacement Stainless Steel Valves 7250-1 Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, 8mm Stem, 4.950 in. Length, Chevy, Ford.
I did not balance the assembly. I asked my resources and they said not to bother, so I listened to them.
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Post by javtwotone on Aug 3, 2023 7:42:05 GMT -8
Very nice Kevin! You sticking with the 3spd auto?
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Post by stickshifter on Aug 3, 2023 9:24:14 GMT -8
Very nice Kevin! You sticking with the 3spd auto? No sir. I am getting the AW4 rebuilt so I can gain the overdrive. Plus the ratios are better for off road. Ratios for the 998: 2.45/1.45/1.00:1 Gear Ratios for the AW4: 1st: 2.80 2nd: 1.53 3rd: 1.00 4th: 0.75 (23-spline, 0.705 21-spline)
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Post by spud on Aug 3, 2023 9:45:57 GMT -8
I have heard similar opinions on re-balancing the amc six. I suppose if the bobweights are similar and not a lot more or less than the factory bobweight, it will be good. There is little point trying to rev one over 5k.
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Post by stickshifter on Aug 3, 2023 17:50:31 GMT -8
I have heard similar opinions on re-balancing the amc six. I suppose if the bobweights are similar and not a lot more or less than the factory bobweight, it will be good. There is little point trying to rev one over 5k. If an appropriate firing order is used, a straight-six engine has perfect primary and secondary engine balance. The primary balance is due to the front and rear trio of cylinders move in pairs (albeit 360° out of phase), thus cancelling out the rocking motion present in a straight-three engine. The secondary balance is due to the crank throws being arranged in three planes offset at 120°, which results in the non-sinusoidal forces summing to zero for all free forces up until the sixth order. en.wikipedia.org/wiki/Straight-six_engine
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Post by javtwotone on Aug 4, 2023 5:59:53 GMT -8
Very nice Kevin! You sticking with the 3spd auto? No sir. I am getting the AW4 rebuilt so I can gain the overdrive. Plus the ratios are better for off road. Ratios for the 998: 2.45/1.45/1.00:1 Gear Ratios for the AW4: 1st: 2.80 2nd: 1.53 3rd: 1.00 4th: 0.75 (23-spline, 0.705 21-spline) HOLY CRAP Kevin, your whole package is like the ultimate Eagle set-up! Maybe nose spray with help with the sinusoidal forces issues..
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Post by spud on Aug 4, 2023 7:28:00 GMT -8
Uhh, a 42re has 2.84, 1.57. 1.0, and .069, and i think your 231 will adapt…. Just sayin. I know a cherokee or wagoneer already has a bunch of good stuff in it but your not building one of those. Maybe you are? And dont know it yet Main difference is the framed chassis over the unibody is gonna take a bunch more off roading. Just being the controversial argumentative clown i am. I know an eagle ( and you too) is/ are all about fun and uniqueness … which i am all for. I have an old 69 javelin. I think it would go on a cherokee or wagoneer platform. I also have a trashed cj-5 that i could stretch the frame … but i’m 61. And dreams are easy. This is a super thread and your a great creator, and the pics are fantastic. Not trying to hijack 👍🏻 I just noticed the spacer on the connecting rod…. Wow!
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