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Old 09-19-2005, 03:49 AM   #1
pete wood
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Join Date: Sep 2005
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1960 VW buggy + EJ25
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Lightbulb Adjustable cam gears for an EJ25 DOHC?

Hi, I have an EJ25 DOHC motor (with factory loom and ECU) in my VW buggy. It goes well, but I wondering whether is any gain in performance to be had from these motors from adjustable timing gears on the stock cams. Also, if this is possible, will the factory ECU accommodate the changes or will it need to be chipped or retuned in some way? (I really need to keep the factory ECU for budgetry and registration reasons.) Also, will a set of cam gears for an EJ20 fit the EJ25? I know they share the same timing belt, so I reasoned this might be the case.

I ask this because I am in Sydney, Australia and no one over here pays much attention to this motor. Seems to me that with 2.5l and 10:1 comp ratio, it should be able to do a little better than 165hp at 6000rpm. What do you guys think?
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Old 09-19-2005, 05:04 AM   #2
Kostamojen
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Nobody has done adjustable cam gears for the EJ25's. There was a reason for it, but its been years since ive seen the info about it so I dont remember.

Meanwhile, read through Cobbs website for more info about stuff you might actually want to consider doing:

http://cobbtuning.com/impreza/
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Old 09-19-2005, 07:11 PM   #3
John*G
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If your only looking for 3-4 degrees try experimenting with a offset crank shaft key. You may have to make one yourself. They are used in V8's a lot and you maybe able to modify one.
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Old 09-20-2005, 12:13 AM   #4
pete wood
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Ford Mulberry

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Quote:
Originally Posted by Kostamojen
Nobody has done adjustable cam gears for the EJ25's. There was a reason for it, but its been years since ive seen the info about it so I dont remember.

Meanwhile, read through Cobbs website for more info about stuff you might actually want to consider doing:
Thanx, Already got a big aftermarket air cleaner and revised exhaust. Love to get some cams like that. Unfortunately my problem is that the company being in the US, it will cost me over $2000Aust by the time I get it here coz I am not sending my factory cams to them. I need to keep them if they need to go back in at some stage. $2k for max 10hp is very expensive. Does anyone have the specs for the stage three set of cams? Maybe I can get a set ground over here for cheaper. BTW, are EJ25 cams the same as EJ20s or do they differ in size?
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Old 09-20-2005, 01:06 AM   #5
2slofouru
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Probably wouldn't be a good idea to play with cam gears. You might have a little bent valve action happenig if you do.
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