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View Full Version : 89 jeep wagoneer limited 4.0 bored 0.030 over



greenchevy
05-15-2009, 10:39 PM
i have a 4.0 engine and its bored 30 over i was wondering if someone might know what the make the engine now? its more then a 4.0 now since the bore.

BlueXJ
05-15-2009, 10:42 PM
Call it a 4.2L then. That would be close and they do round the numbers up.

greenchevy
05-15-2009, 10:46 PM
also how much horse power would this give also torque?

BlueXJ
05-15-2009, 10:57 PM
Doubtful they would change unless they decreased since you are not pulling in any additional air/fuel mixture to ignite and the combustion chamber has now increased in size.

greenchevy
05-15-2009, 11:04 PM
so what can i do to gain back the power i'm loosing?

BlueXJ
05-15-2009, 11:11 PM
Bored TB or a supercharger. Big bucks either way but a substantial power gain b/c you are stuffing more burnable air/fuel in the same space and when ignited will cause more power release due to the sheer quantity of hydrocarbons being burned.

greenchevy
05-15-2009, 11:16 PM
how do you bore the throttle body? would a throttle body spacer help?

BlueXJ
05-15-2009, 11:27 PM
There are companies that do that boring. There is much debate over the spacer doing any good. In theory it has the potential to increase the volume and also the velocity of the incoming air charge but it is quite small and also would only be significant at a higher speed but it also couldn't hurt the mixture. We have a member who could address that more directly as he made some spacers and undoubedly tested them. Leave him a PM and he may be able to more fully answer your questions about spacers. He is HowlerGT.