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Old 11-03-2001, 06:05 PM   #1
FormerSubTech
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Question does anyone have the cobb street cams

hi gang,

I'm new around here. I was a dealership tech in a past life specializing in transmissins, engines, fuel injection and electrical on Mazdas and Subarus. I stopped fixing cars for a living in 1991. I only have limited knowledge of the newer models because the Legacy was still a fairly new model when I left. I worked on a tone of the old push rod cars and the leaky Loyales. Don't tell anyone but I was even trained on and have rebuilt ECVT transmissions on Justys (shivering with painful memories).

anyway....

if you break a timing belt, will the valves hit the pistons when running these cams?

my wife drives the subie most of the time but does appreciate extra power. is the power increase noticible on the low end and mid range? cobb doesn't have an RPM based dyno chart.

are there any negative side affects from these cams like potential to load up the spark plugs at idle or poor running at high altitude?

thanks gang
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Old 11-03-2001, 06:10 PM   #2
Eric SS
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From what I gather, regardless if you have the Cobb cams or the stockers, the EJ25 SOHC engines are interference engines.

Eric
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Old 11-03-2001, 06:12 PM   #3
HndaTch627
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well seeing as how they are a higher lift cam i would assume that you are greatly increasing the risk of bending valves if the belt breaks. Now subaru's like most honda's are not supposed to bend valves when the belt breaks(as you probably well know) but i have seen honda's bend valves. I really don't have a yes or no answer but my answer and common sense would say yes.

jeremy
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Old 11-03-2001, 06:27 PM   #4
FormerSubTech
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based onmy experience, Hondas were known for bending valves if the timing belt broke. if they changed that philosophy, it happened sfter I stopped fixing cars. To my knowledge, Subarus (and even Mazdas) have always been the opposite.
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Old 11-04-2001, 01:56 AM   #5
Midwayman
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I have the cams... as to breaking belts... like hondatech said. Run the risk either way.

Power delivery is mainly high end. 3.5k and up, the difference is very noticable, and the engine is much smoother at high rpms than before. Basically the way the car should have been cammed in the first place. If you are looking for more midrange torque the Brullen header might be your best bet.
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Old 11-04-2001, 10:27 AM   #6
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EJ25's are DEFINATELY vavle benders.

Tats.
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Old 11-04-2001, 10:57 AM   #7
Panzer1939
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There really aren't any downsides that I have seen. As Midwayman said, the biggest difference is up top. Idle is almost stock, not really a noticeable change. I love them.

Tim Albert
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Old 11-05-2001, 09:57 AM   #8
Layman
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Quote:
Originally posted by HndaTch627
Now subaru's like most honda's are not supposed to bend valves when the belt breaks...
Ha! Since when? I think just about all Hondas run interference engines. I know for a fact that my H23 did - I found out the hard way.
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Old 11-05-2001, 12:43 PM   #9
HndaTch627
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the H series are interferece the D-Series was never known for ending valves, the B Series will bend valves, and surprisingly i have seen a few H series block that have broke the belt and never bent a valve. It's kinda funky like that. But like i was sayign subaru cams are designed to stop at a certain spot and not bend valves. Not sure if this is true and i'd HATE to find out the hard way personally.

Jeremy
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Old 11-05-2001, 12:44 PM   #10
IowaRS
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Default Cobb cams without other mods?

For those of you that are running the Cobb street cams, do you have any other mods? I'm curious about proper fuel delivery with the stock ECU.

Thanks
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Old 11-05-2001, 05:46 PM   #11
edekker
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IowaRS,

You should have no problems with fuel delivery from the stock ECU.
I've got the Cobb street cams and
Cobb TB,
Extrude-Honed intake,
Ported heads,
Borla header,
Cobb cat,
RalliSpec catback,
Eaton (Roots) SC, disengaged no less (temporarily),
Upgraded fuel pump and SVX FPR (brings idle FP back down).

The Stock ECU is still running the show the car runs and idles as stock.

Ed.
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