The intakes are the only ones I replace. The exhaust retainers don't split, because the valves will hit the piston first. Also, the exhaust valves don't float at the same RPM as the intake because of their weight.

IMO:

The retainer splitting over-rev RPM is raised with the 2.2 retainers. Possibly beyond the point in which the exhaust valves bend.

 

Yes, I'm sure it is. My point was that this is only one possible failure mode. By addressing this one, you reduce the margin on others. In a similar manner, by replacing the retainers with Ti you increase the margin on overrevs but decrease the durability. It's all a balance. But it may very well be that the design balance with the AP2 retainers is better for the typical street car application.

I assume the Honda engineers have certain design guidelines they follow, and those guidelines just didn't allow for any more mass in a 9K engine than they used for the AP1 retainers. When they lowered the redline, they beefed up some things because they could.

 

so that guy is saying all 16 of his retainers were cracked........... crazy!

 

Billman...

So when you replace retainers, are you using the compressed air method to do it? And when you are using the compressed air, do you have that piston at TDC or BDC...

And do you have the part numbers for the stuff one would need for replacing retainers?

And do you also have the part number for the oil squirters off hand? I had it written down somewhere, and cant find that paper now.

 

Compressed air, at least 70 psi. Full psi is recommended, like 150.

Piston at BTC. At TDC, the air will push it down to BDC anyway.

 

I call BS on 16 craked retainers.

 

I'm not saying you're lying, only seeing something we are not.

 

If mine are indeed cracked, it will proove cars do not have to be overreved to be cracked as I bought the car brand new and I have never overreved the car

 

Sometimes. Sometimes it doesn't. But it's "metastable", meaning that if it's actually at TDC and nothing moves, it will work just fine. But if moves even just a little bit off TDC, it will shoot to BDC with great force. Not a safe situation.

 

I know in 5% of cases it will stay at TDC. I'm trying to keep it simple here for all