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HiFiGuy
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Why is it that alot of high-powered B-series engine builders use an LS block instead of, for example, a Type R block? Judging from how expensive some of these engines are, I don't think the reasoning has to do with the Type R blocks being too expensive! I know a guy who just bought a complete blueprinted and balanced motor from California, and it has a Type R head, pulleys, and throttlebody, aftermarket high-performance injectors, plus forged pistons, and rods, a turbocharger with an intercooler, balanced and knife-edged crank, all built around an LS block. What's the deal?
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CivicB18
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The 1.8 LS block has more displacment than the 1.8 GSR and the 1.8 Type R. I think its the stroke that is longer, which aids in making more torque. The GSR/TypeR engine actually displaces like 1.7 and some change. This seems to compliment the "bigger is better" theory. Im currently buying parts for my GS-R powered 95 Civic sedan. Im going with a B20Z from a CR-V and a Greddy turbo for a 99/00 Civic Si. Shhh, dont tell the wife. The B20 with a Vtec head is the king of the "Frankenstien" B-series engines. Now that the K20 is out and making ungodly amounts of power, they should knock the B -series of the throne.
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HiFiGuy
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The motor I was referring to was being built with a B20. In this case, I think the block from an LS is going to be bored out to achieve 2.0 liters of displacement. It is supposedly going to be good for close to 400 whp after it is buttoned up. I'll believe it when I see the dyno sheets. I guess I don't understand why boring a B18C5, for example, wouldn't accomplish the same goal, unless it has too little cylinder spacing to achieve the desired finished bore dimensions. Thank you for the insight, and if anyone else out there has more to add, I am listening!
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notyper
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The bore spacing is the same on all the engines. The key advantages on the B18C1 and B18C5 are better cranks, better rod/stroke ratios and oil squirters. The latter can be added to the B18B (LS) blocks. But the first two items can't.
For a mild street engine, its much cheaper to do a B18B with B16A head, but for a race engine, the B18B bottom end (crank in particular) doesn't cut it. The best all-motor guys choose to run the B18C1 or B18C5 crank (the C5 crank is the best) because they are heavier and have less flex.
SC
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TurboTegGSR
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The bores are not the same the b20b/z are 84mm. Also the crvtec is plagued with a lack of intake valve relief clearance on the pistons and shitty sleeves that like to crack with the high friction and heat caused by the high rpm these setups like to have and also from the angle of attack of the piston rod combo on the sleeves due to the lower numerical rod ratio length.
Last edited by TurboTegGSR on 07-24-2003 13:54
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hondatech2
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Bottom line, you can make power with either motors. There are tons of LS blocks making them cheaper, There are little type-r and gsr VTEC motors making them expensive.
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