[QUOTE=RED MX5,Oct 13 2007, 08:25 AM] This is an intrnational site, so I always try to say F20C or F22C, and AP1 or AP2, as appropriate, because there are three conbinations.

AP1+F20C
AP2+F20C
AP2+F22C

But living in the USA, I'm use to only two combinations so I think I screw it up sometimes too.

I believe that all F20C's have the same valve spring retainters, regardless of whether the engine came in an AP1 or AP2.

 

Billman - is there a noticeable weight difference between 2.0 and 2.2 ( ) retainers?

 

Clearly the difference isn't enough for Billman to be worried about performance at 9k.

Some time back Bill said that the difference in weight/mass was minimal, but at the time he hadn't actually weighted retainers.

Bill, any update on this?

 

P.S. I just noticed.. its a PM2000

 

so it's established that there's an advantage using 2.2L retainers on the intake side of 2.0L engine, and is not necessary for the exhaust side.

is there a reason to not use 2.2L retainers on the exhaust side of 2.0L engine?

 

I hope not.

 

Because the exhaust valves are the first to contact the pistons in an over-rev.

You don't want to add any addl weight to the exhaust side.

You CAN surly do it, and I have in the past....it's hard to say if the valve/piston-contact-speed would be lowered, but technically it would.

If I had to guess, based on the difference in retainer weight, it would be 25 rpms or less.

I wish I didn't have to say it, but I have found ONE BARELY broken exhaust retainer in my s2k career, somewhere over 500 cars. This was also on the worst case of broken intake retainers I'd ever seen.

Bottom line, IMO, you can definitely use them. to me it's just not necessary.

Grunts2k was the worst car...maybe he'll chime in