Engine & Internal Chat about beefing up your engine's insides here.

What is it!?!

Old 10-07-2007, 10:55 AM
Thread Starter
Join Date: Oct 2007
Posts: 22
Default What is it!?!

I have a 05' 3.0Vtech but i have no idea what the motor is past that. What is it called what is the compression what are the heads and why does no one make aftermarket heads or headers?
Old 10-07-2007, 11:08 AM
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Join Date: Jan 2006
Posts: 1,475
Default RE: What is it!?!

im sure people will correct me if im wrong, the engine is a J30a4, 10:1 compression, headers/exaust manifolds arent made becuase they are welded to the head(which is the upper half of the combustion chamber which houses the cam, valves, valve springs etc) changing the headers means a crap load of custom work unless you can swap them with another honda/acura head, and there are two heads cause its a v6 btw
Old 10-08-2007, 10:50 AM
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Join Date: Aug 2007
Location: Wayne, NJ
Posts: 6,213
Default RE: What is it!?!

Compression ratio is the volume of the combustion chamber compared to the cylinder displacement. On your engine, a cylinder moves 0.5L per cycle (2 piston cycles per revolution of the engine). A 10:1 CR means that you combustion chamber is 0.05L. The pistons must be rated for this CR or better.

Heads are the upper half of the engine that contain the valves, springs, rockers, ports, camshaft(s) and combustion chamber. An inline engine has 1 head and header while a V has 2.
Old 10-08-2007, 07:42 PM
Join Date: Nov 2006
Posts: 430
Default RE: What is it!?!

1) it's not vtech, it's vtec

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