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Discussion Starter · #1 ·
This goes out To any and all engine builders who would be interested in building my 2.4L EFI motor. If there is any one out there interested in this task let me know and we can discuss the details.
Thanks
 

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Opel Tinkerer and Rescuer
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http://www.sportscarworkshops.com

They are in Richmond, VA and do racing work, etc.

They specialize in British and Italian, but are not afraid of working on anything.

Not sure if they would want to do a long distance engine build, but they may.

They are the ones I plan on doing my Bitter motor with.
 

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What do you want to do with the engine? Head work, more displacment, roller rockers? If you want a custom intake for that efi setup, TGSI could fab you up something. Acutally putting together the efi box, wiring, and tuning is fairly striaght forward, just takes time. The best way to tune is with a dyno, but with enough road tests you can have your tables pretty close to ideal. If this is a seperate engine then the opels unl 2.4 you mentioned in another thread do you want to take a 1.9 and bump up the displacment to 2.4?
 

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Have you thought about doing the engine yourself? How crazy are you going to go with it? How much HP?

It's not too tough to bring the engine to a 2.5 litre with custom pistons, and porting a 2.4 head is fairly straightforward compared to a 1.9 head.

Bob
 

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Discussion Starter · #5 ·
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.
 

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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.
 

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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.
They can do all that, they can even get custom pistons made if you are so inclined.

The cost they quoted to me on my 3.9L which will require custom pistons, porting, valve job, etc.. was $3500 (max). But I am bringing them a motor that lost two pistons, so they will have to bore, custom design the pistons.

So I would think for a blueprint of your motor, etc... would be in the $2400 range.

BTW, give me a holler when you come to drop the engine off with them. I work only a few blocks from them.
 

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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.
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.com
 

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If I were you, I'd consult with RallyBob about mods to the head. 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.

I'd also check out the tech info at http://www.opeltuners.com/ since this is a European engine.

Paul
 

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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.
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.

Here's a photo of a stock 2.4 piston and one of the custom 2.5 pistons I had made.

Bob
 

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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.
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.

I did a head like this for the yellow Ascona wagon at Carlisle that dynoed at 150+ at the wheels. With the appropriate induction system and a proper 4-1 header, that head can flow enough to make 220+ hp at the flywheel.

Bob
 

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Bob, could you recommend the proper combination of valves, springs, etc..

For the 2.4 / 3.9L Head assume stock hyraudlic cam.

Need info for my engine builder.. unless of course you were going to do my head for me .. wink wink..
 

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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 titanium 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.
 

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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.
This with the same "big-ass Chevy valves" (1.94"/1.60") - I assume 1.94 is intake and 1.60 exhaust?
 

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That's correct Charles.
 

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I know nothing with you is simple, and asking the right question is the key. Actually making assumptions and having you correct me works best.

OK, taking a late model head, and upsizing the valves.

I would use:

Chevy valves : (1.94" in /1.60" exh)

1.25" titanium retainers (Chevy?) - BTW where would I get such animals?

Custom springs or springs that are 1.25" in diameter and 90 pounds of seat pressure and 200-210 open pressure - again location?

Lastly could use these with the currently available roller rockers? Also do these rockers have a different ratio than stock?

This all on a head that will use the cam it came with, hydraulic lifters, and no stud girdle (since getting one special made for my 6 cly would be a pain in the ass and I don't plan on reving the engine passed highway speeds and don't plan on any stoplight racing.

What else do I need to tell the shop? Or should I know?
 

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GEEZ them some big ass valves.. (Its not like you didn't tell us).
 

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Springs!

When my 1.4" titanium Chevy caps arrive I will be able to tell you more certainly but mean while consider these springs Pioneer RV - 925 - 4 OEM 2.4 replacements. A pic is attatched to my post in "Cylinder Head Upgrades" aand it won't let me do it again.
 

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Can't find that post.... got a link?
 

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I know nussing!

I again refrain from giving specifics, since I've never seen a 3.9 head in person and therefore do not know if any of these parts will fit correctly. The most critical aspect is the springs as I said, but the installed height is an unknown variable to me with that head.

Bob
 
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