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Old 12-12-2003, 12:22 AM
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Josh
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Join Date: Apr 2003
Location: Ohio
Posts: 1,597
Make: Audi
Model: A4 Quatro
Engine: 2.0T
Secret Cam Swap info

The 2.4 Twin Cam Secret Revealed!



Most of the die-hard 2.4 owners know that finding good camshafts that improve power are non-existent or have to be custom made. Now you should know that the 2.3 Quad 4 engines had better camshafts, even over stock for the newer 2.4 . The 2.3 and 2.4 are very similar in design, but have some very different parts in them both. Lucky for us the camshaft towers (where the camshafts sit), are the same for both engines and there fore are the same cam shafts. So we can use Quad 4 cams in the LD9 as upgrades. Now what makes this swap a bit different is that the new 2.4 engines have the power steering pump hex shaft machined with the input for the camshaft position to the intake camshaft. Now with the 2.3 the setup is different except for the year 95', where the camshaft has been machined for the hex shaft that drives the power steering pump mounted to the back of the engine and has an input for the cam position sensor, which is the same as the 2.4. For this swap you need the 95 2.3L intake camshaft, *VIN D #24574239 and the LO (LD2) 93-94 Quad 4 exhaust cam, *VIN D #24570698.

Ok here are the spec's on the stock camshafts for the 2.4, 2.3 LO, 2.3 HO, 2.3 W41, Mantapart, and Genertec XX5 Camshaft Spec's. When you compare the stock 2.4 cam specs to the 2.3 you can see that for the most part are close but when you take the 95' 2.3 intake camshaft (you can only use this one because it has the hex for the power steering pump and camshaft position sensor) it has 200 degrees @ .050" with .360" lift. The Stock 2.4 has 198 degrees @ .050" with .354" lift. The 95' 2.3 has higher lift than the 2.4 and rotates 2 degrees more. Now when you look at the 90' 2.3 exhaust camshaft, it has 200 degrees @ .050" with .375" lift and the 2.4 has 187 degrees @ .050" with .346" lift. The 2.3 has a much higher lift than the 2.4 and rotates 13 degrees more. When combined together you can see any where from 10 hp to 20 hp depending on your modifications to your engine. The idle is perfect and the ECM needs no modifications. On a side note for those who would like to replace the lifters (which is recommended by all) is that the bore of the lifters is 33.0mm for 95' 2.3 and 96' 2.4, and the bore of the older 2.3's is 35.0mm.

1995 Cam Specs
200 degrees @ .050" with .360" lift for the intake
LD2 (1990+) Cam Specs
200 degrees @ .050" with .375" lift for the exhaust

See how close the 95 2.3 intake and the 2.3 LO Exhaust camshaft are to each other.

Camshaft Spec's

Stock 2.4 LD9 Cam Specs
198 degrees @ .050" with .354" lift for the intake
187 degrees @ .050" with .346" lift for the exhaust

Stock 2.3 LD2 (1989) Cam Specs
212 degrees @ .050" with .345" lift for the intake
212 degrees @ .050" with .345" lift for the exhaust

Stock 2.3 1995 Cam Specs
200 degrees @ .050" with .360" lift for the intake
200 degrees @ .050" with .360" lift for the exhaust

Stock 2.3 LD2 (1990) Cam Specs
200 degrees @ .050" with .375" lift for the intake
200 degrees @ .050" with .375" lift for the exhaust

Stock 2.3 HO cams Specs
212 degrees @ .050" with .410" lift for the intake
212 degrees @ .050" with .410" lift for the exhaust

Stock 2.3 W41 cams Specs
219 degrees @ .050" with .410" lift for the intake
219 degrees @ .050" with .410" lift for the exhaust

Mantapart Mild Cams Specs
198 degrees @ .050" with .360" lift for the intake
201 degrees @ .050" with .374" lift for the exhaust

Genertec XX5 Specs
211 degrees @ .050" with .360" lift for the intake
212 degrees @ .050" with .360" lift for the exhaust


How to do this:

Here are the exact directions from GM on how it remove and install camshafts.

Intake camshaft removal/install
http://www.ny-jbodies.org/library/en...4intakecam.htm
Exhaust Camshaft removal/install
http://www.ny-jbodies.org/library/en...exhaustcam.htm


Optional Parts (Gaskets, etc...)

*12355988 - Intake or exhaust cam carrier gaskets (upper and lower)
*12363173 - Intake or exhaust cam carrier gaskets (upper and lower)
*24575512 - Tensioner. Not required, but if you have timing chain noise, change this. Also, be sure you are familiar with how this part works because it has to be pre-loaded once installed to snug up the timing chain.
*24575513 - Tensioner shoe. This will probably break when you remove, so change it anyway.
*24575255 - Guide. Not required unless yours are worn.
*24575257 - Guide. Same as above.
*24575256 - Guide. Same as above.
*992704 - Assembly Lube. Good idea to coat the cam lobes and the carriers where the cam contacts with this stuff.
*992869 - Oil supplement. The GM manual calls for this stuff when you do the cams.
*12360464 - Timing chain cover gasket. (optional)
__________________________________________________ ____________________________________________
*- GM part #
Written By Nathaniel Shutters (Zeroburn)

Information taken from:
http://babcox.com/editorial/ar/ar40032.htm
http://www.j-body.org/forums/read.ph...=79273&start=0
http://www.ny-jbodies.org/library/en...4camsecret.asp

Last edited by Josh; 01-08-2006 at 01:52 PM.
 

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cam, secret, swap, twin



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