hi i'm going to be buying some headers for my 96 eclipse really soon i need to know what is the difference between the 4-1 and 4-2-1 header where will my gains and loses be at.
thanks

 

The difference is exactly how they are named. One of them goes from four directly to one to the downpipe while the other goes from 4 then combines to 2 then goes to 1. As far as hp gains. I really dont see you getting more than 5hp from it

 

i heard that with one you gain mid range and loose top end what would be the best to go with on the eclipse motor

 

thanks te, that was a lot easier of an explanation of what i had... but as far as the two different headers, im assuming you have either an rs or gs... you wont notice a difference in power. there's not enough power coming out of the 420a to be able to notice a difference

 

anybody have any idea wat the comression is on a 420a motor and wat the max it can hold and wat can i do to raise the compression.

 

The compression ratio on a 420a is 9.8:1. And people please keep the flaming to a minimum on this question .

You cant just raise and lower compression. I think you need to do alittle more research before you start modding more and try and learn about cars first. The compression has to do with the volume in the cylinders. The only way to get higher compression is to upgrade the pistons. Now the thing is say you wanted to turbo the car. Well the stock engine with the CR it has can only handle about 10psi. Now going with a higher compression actually is bad for a turbo. You cant a lower compression if you are gonna go turbocharging. Going higher is for staying NA.

 

i already know about the no turbo with higher cr and i know about thevolume in the the cylinder cause i've already built a hybrid honda but i know those are easy to do.i just wanted to find out what my options were for raising the compression. i was told i could use some turbo pistons and that would work.

 

Turbo pistons are lower compression, and to my knowledge there is no car that comes stock with a turbo 420a. So the only way to get a higher compression is to buy aftermarket pistons