SOHC EJ25: Which Years and Models Came With Two Metal Cam Gears?

DSM_Outback · 10-10-2010, 12:13 PM

Which Years and Models Came With Two Metal Cam Gears?
I have a set of EJ251 heads and one gear is metal and the passenger side is bakelight.
What year and model do I need to tell the stealership to get both metal gears?
Thanks.

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BAN SUVS · 10-10-2010, 02:46 PM

No idea- but the bakelite ones are durable enough. I wouldn't make any effort to switch it out personally.

DSM_Outback · 10-10-2010, 07:37 PM

I'm building an SOHC headed hybrid with lots of other goodies that don't belong in NA powertrain, so I'd rather do it right once.

williaty · 10-10-2010, 10:59 PM

You know that even the STi's come with some plastic gears on the non-dual-AVLS ones, right?

Just use the plastic one, that counts as doing it right.

BAN SUVS · 10-11-2010, 12:01 AM

Yeah, there are a lot of little things that you want to pay attention to, but that particular part is fine.

Storm · 10-11-2010, 07:58 AM

I would agree with this. The lighter plastic cam gear is not an area to seek upgrade from.....even with big lopey cams.

Jay

watchdoc · 10-11-2010, 09:50 AM

All this being said... is there an advantage to using the bakelite gears? I realize the minor weight savings but how bout NVH when running cams?

grafton · 10-11-2010, 10:06 AM

the early sohc 2.2's had 2 metal cam gears...

DSM_Outback · 10-11-2010, 12:15 PM

Quote:

Originally Posted by watchdoc

All this being said... is there an advantage to using the bakelite gears? I realize the minor weight savings but how bout NVH when running cams?

I figure that's why the OE did it.

I was a little worried running two crawford adjusters and some Delta 1500HLs

Matt Monson · 10-11-2010, 06:03 PM

The OE did it in an attempt to save a few engines when timing belts slip or in accidents. What happens is the gear shatters stopping the rotation of the timing belt, therby saving the valves. I've purchased more than one core engine with a popped timing belt and a broken cam gear that had no damage, so I think it works.

wmdoucette · 10-14-2010, 10:28 AM

Quote:

Originally Posted by Matt Monson

The OE did it in an attempt to save a few engines when timing belts slip or in accidents. What happens is the gear shatters stopping the rotation of the timing belt, therby saving the valves. I've purchased more than one core engine with a popped timing belt and a broken cam gear that had no damage, so I think it works.

After an off into a good sized tree last season, our 2007 STi finished a stage and was limping back to service when oil pres dropped to 0. Shut her down and loaded up the trailer with our tails between our legs. Once I started tearing into it, I found the disintegrated RH Exh gear, and the belt resting on the round head casting behind it. Not a hint of internal damage. New belt, gear, cover, bumper, fender door hood, rad supports headlight.... back to the races.

Car Striking tree

At the time I was pretty upset that they would make a plastic piece of junk, but reading Monson's post, that actually make a good deal of sense from an engineering stand point.

10-10-2010, 12:13 PM	#1
DSM_Outback Scooby Specialist Member#: 56345 Join Date: Mar 2004 Location: Western Colorado Vehicle: 93 Swapped L Green	SOHC EJ25: Which Years and Models Came With Two Metal Cam Gears? Which Years and Models Came With Two Metal Cam Gears? I have a set of EJ251 heads and one gear is metal and the passenger side is bakelight. What year and model do I need to tell the stealership to get both metal gears? Thanks. * Registered users of the site do not see these ads.

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10-10-2010, 02:46 PM	#2
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	No idea- but the bakelite ones are durable enough. I wouldn't make any effort to switch it out personally.

10-10-2010, 07:37 PM	#3
DSM_Outback Scooby Specialist Member#: 56345 Join Date: Mar 2004 Location: Western Colorado Vehicle: 93 Swapped L Green	I'm building an SOHC headed hybrid with lots of other goodies that don't belong in NA powertrain, so I'd rather do it right once.

10-10-2010, 10:59 PM	#4
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	You know that even the STi's come with some plastic gears on the non-dual-AVLS ones, right? Just use the plastic one, that counts as doing it right.

10-11-2010, 12:01 AM	#5
BAN SUVS Scooby Specialist Member#: 28685 Join Date: Nov 2002 Location: Reno, Nevada Vehicle: 2004 FXT 4EAT very STi'd	Yeah, there are a lot of little things that you want to pay attention to, but that particular part is fine.

10-11-2010, 07:58 AM	#6
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	I would agree with this. The lighter plastic cam gear is not an area to seek upgrade from.....even with big lopey cams. Jay

10-11-2010, 09:50 AM	#7
watchdoc Scooby Specialist Member#: 104821 Join Date: Jan 2006 Chapter/Region: South East Location: eastern, NC Vehicle: 2002 2.5 RS PSM	All this being said... is there an advantage to using the bakelite gears? I realize the minor weight savings but how bout NVH when running cams?

10-11-2010, 10:06 AM	#8
grafton Scooby Specialist Member#: 187936 Join Date: Aug 2008 Chapter/Region: MAIC Location: Fairmont WV Vehicle: 97 Legacy w12:1CR 05 LL Bean outback	the early sohc 2.2's had 2 metal cam gears...

10-11-2010, 06:03 PM	#10
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	The OE did it in an attempt to save a few engines when timing belts slip or in accidents. What happens is the gear shatters stopping the rotation of the timing belt, therby saving the valves. I've purchased more than one core engine with a popped timing belt and a broken cam gear that had no damage, so I think it works.