thesnowboarder

iTrader: (15)

I read about an exintake swap in airbrush1's thread but didn't want to jack his, the mod consists of putting an exhaust cam in place of the intake cam. I did a search both here and on m.net and couldn't find much info.

Anyone wanna chime in? What would be a benefit of doing this? What would be a downfall if any?

KPLAFIN

iTrader: (1)

Apparently it gives you a few horses for NA power, not so much for boosted cars. try searching for exhintake (with the "h") and you'll probably get a few more search hits.

MattEGTR

"Apparently" being the operative word. Half of the people that try it claim it works, the other half see no benefit, with the only difference being that the powerband has been moved up in the RPM range.

That's the impression that I get from the Protege forums, anyway.

patsmx5

iTrader: (16)

The information is out there, but it's scattered and not well organized. In short you have to drill a locating hole in the cam gear so that the new exhaust cam is indexed correctly. 197.5* clockwise of the old hole is the right spot I think (from memory, go look it up).

This mod will increase lift and duration.

Ben

iTrader: (33)

If done on turbo car, it probably should be done with adjustable wheels to allow for the increased duration with less overlap. Should be a marked improvement in power if tuned.

airbrush1

we need a definitive thread.

patsmx5

iTrader: (16)

Indeed, and it needs to pay strict attention to the separation of solid lifter and hydraulic lifter motors. I'll contribute what I know later from my research. I have an extra 99' exhaust cam I'm gonna put in some time. When I do it I will definitely take lots of pics and do a writeup, as the info on this swap for a 99 is terrible.

KPLAFIN

iTrader: (1)

Try to do some before and after dyno pulls too if you haave time/access to a cheap dyno.

patsmx5

iTrader: (16)

That would be nice. But it probably won't happen. I'm waiting to put the cam in till I get rid of this miss I have. I need two more Millenia COPs and I will switch to COP in hopes of remedying my ignition miss. Car runs strong right now, but I know having a random miss is holding it back some. Besides I'll probably see higher than typical gains from a cam swap as I have a lot of head work done.

fahrvergnugen

Are all NAs mechanical? Also, what is the interval of adjustment on them?


Also, who did your head work? Cost?

MattEGTR

NAs have hydraulic lifters.

fahrvergnugen

They went mechanical on later cars? Really?

MattEGTR

Yarly.

patsmx5

iTrader: (16)

89-93's have 1.6L and hydraulic lifters. Can't do the exintake swap on these though as the CAS sensor is driven off the intake cam. Bolt an exhaust cam in its place and there will be no provision to drive said sensor.

94-97's have the CAS driven off the exhaust side. Just cut the drive off an exhaust cam and install it in place of the old intake cams. Hydraulic lifters on this motor too.

99+ has solid lifters, and more aggressive cams.

I did my own head work.

EDIT: headwork cost me probably 200 tops. Would cost anybody I did it for 1K+

fahrvergnugen

I guess they went 'backwards' to wring every little bit of power they could out of that motor... I've been around VWs too long...



Not to come off as critical, but did you have access to a flow bench? Or have you had prior experience with P&Ps?

patsmx5

iTrader: (16)

I don't understand what you mean by the first part.

No I didn't flow bench the head, nor did I "port and polish it". If you're curious as to what I did PM me.

iWeasel410

http://members.aol.com/solomiata/cams.html

Scroll down, looks like same lift longer duration.

patsmx5

iTrader: (16)

94-97 that is true. 99-00 the exhaust cam has more lift and duration.

iWeasel410

http://www.diymiata.com/exhintake.html

Shainz

iTrader: (1)

We need more definite answers! I'm looking forward to doing this mod.