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89 mm big bore kit
- Thread starter bnw
- Start date
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trrdster2000
Luke Skywalker
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bnw,
Without some other goodies you may not see any difference unless your engine is clapped out and you have never driven a good standard engine one.
Wayne
Without some other goodies you may not see any difference unless your engine is clapped out and you have never driven a good standard engine one.
Wayne
Northcoaster
Freshman Member
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I'm not familiar with this kit, but it occurs to me that you are going to see a pretty big bump in your compression ratio. I recall the 87mm setup was good for around half a point or so. Going to the 89's will be a large jump. Just food for thought. Good luck!
Rich
Rich
TR3driver
Great Pumpkin - R.I.P
Offline
Not yet, but I hope to. Got a set on the shelf along with a Larry Young street cam, HS6 carbs, and a 4-2-1 header. Along with the alloy flywheel already on the car, I'm looking for some serious street grunt.
Without any other changes, the C/R should only go up by about 0.6 points (over 86mm liners). Not such a bad thing, since more C/R makes the engine more efficient (meaning both more power and better fuel mileage). But I'll be doing some mild head work to smooth out the sharp edges; my target compression ratio is about 10:1.
Ken G. at BFE put this kit together, and Ken is very conscientious about the stuff he sells. Cooling may be more of a problem as more displacement means more heat, and the 89s are also just a big bigger outside (making the water jacket just a smidgeon smaller); but I expect it to be surmountable.
Without any other changes, the C/R should only go up by about 0.6 points (over 86mm liners). Not such a bad thing, since more C/R makes the engine more efficient (meaning both more power and better fuel mileage). But I'll be doing some mild head work to smooth out the sharp edges; my target compression ratio is about 10:1.
Ken G. at BFE put this kit together, and Ken is very conscientious about the stuff he sells. Cooling may be more of a problem as more displacement means more heat, and the 89s are also just a big bigger outside (making the water jacket just a smidgeon smaller); but I expect it to be surmountable.