They can do all that, they can even get custom pistons made if you are so inclined.bear said:I will try the boys in Richmond, it is actually one about 4 hrs north of me, I have tryied contacting TGSI, by e-mail, phone, this website, and have had no luck getting anyone. I have a 2.4l complete motor coming to me, I would like better ingnition, fuel delivery, port polish heads, three angle vavle job,little bigger cam, possible bore the cylinders, +.0030, balanced and blue printed. and still keep the fuel injection.So I need some one that will know the electronic side of the build as well. I already have custom header and full oversized stainless exhaust.
Bob did a whole article in the OANA a while back. Using primarily off the shelf parts. He only went into detail on the block side though. I think most that article is online at http://www.opel-na.compvcar said:are u talking about taking a 1.9l to a 2.5 or taking larger size engine to 2.5 2.4l i would be interested in how much this might run, like machining cost and parts cost and such other things that would need done like custom header etc.
I was referring in this case to enlarging a European 2.4 into a 2.5. This is accomplished quite easily by having custom pistons made that are 2mm larger. The displacement would then be 2512 cc's.pvcar said:are u talking about taking a 1.9l to a 2.5 or taking larger size engine to 2.5 2.4l i would be interested in how much this might run, like machining cost and parts cost and such other things that would need done like custom header etc.
The 2.4 head flows pretty well out of the box, at 110 cfm intake and 92 cfm exhaust (about the same as a mildly ported 1.9 head). With stock valves, the head can be ported and flow should improve to about 120-125 cfm intake and about 98-100 exhaust. However, for the real power, you can install some big-ass Chevy valves (1.94"/1.60") and get 142-150 cfm on the intake side and 114-118 cfm on the exhaust side.Paul said:Are there pitfalls in doing combustion chamber/port work with out valve size changes, such as in the 1.9 Intake? Bob? Then buying a cam that improves the intake to exhaust flow balance.
This with the same "big-ass Chevy valves" (1.94"/1.60") - I assume 1.94 is intake and 1.60 exhaust?RallyBob said:Don't know what springs to use Charles, I haven't used a hydraulic cam for a performance 2.4 head. They'd have to be VERY light tension compared to solids to avoid collapsing the hydraulic lifters. I imagine with some research it would be no big deal, but since I use 1.25" diameter titaniumm retainers with the Chevy valves, the springs would have to be the same diameter to work with that combo. I'd target 90 pounds of seat pressure and 200-210 open pressure. Any more will just waste horsepower and wear parts more quickly.