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H22a4 Interference or Not?

 
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Old 03-27-2012, 06:39 PM
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H22a4 Interference or Not?

I was driving at about 3k RPM, yesterday, and my timing belt came off. I had the timing done only about 3K miles ago. The shop told me that the engine has a interference design, but I have heard from numerous people online, who swear it is non-intereference. Some have said that the H22a4 engine is in interference, only when VTEC is engaged (as in VTEC, the valves take longer strides). I have looked at the diagrams for the stock H22a4 heads, and in fact, they are 'notched'. Does notching suggest that the engine was designed to avoid interference? Does anyone know for sure, or from experience(s) if this Engine is in Interference or not?

Last edited by zadeh79; 03-27-2012 at 06:55 PM.
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Old 03-27-2012, 09:39 PM
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Re: H22a4 Interference or Not?

yes, it is.
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Old 03-28-2012, 03:38 AM
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Re: H22a4 Interference or Not?

Nearly all Japanese engines are of the interference design, as it is more efficient. If the timing belt came off, you better hope the shop that did your timing is willing to repair any damage done, such as replacing valves, milling the cylinder head, etc. The pistons are notched to provide a pocket for the valve to fit in, otherwise the valve and piston would collide and you would have major problems. As for how higher valve lift and duration work in an interference engine design, I'm baffled. But we're talking about Honda, they make everything from lawnmowers to jet airplanes.
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Old 03-28-2012, 09:20 AM
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Re: H22a4 Interference or Not?

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Originally Posted by ogsmakdade View Post
yes, it is.
^^ this ^^


if the belt came off completely, you can pretty much kiss the entire engine DUECESSSS.
if it ONLY skipped A COUPLE teeth.... there's a chance you can salvage something.
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Old 03-28-2012, 10:28 AM
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Re: H22a4 Interference or Not?

if i were you i would do my best to make that shop repair all the damage they caused by doing the job incorrectly at no charge, that should not happen after just 3k
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Old 03-28-2012, 01:35 PM
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Re: H22a4 Interference or Not?

The h22a4 is an interference, & your engine is a goner
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Old 03-28-2012, 06:12 PM
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Re: H22a4 Interference or Not?

h23 is also interference, but I had one come off the old engine once, (shortly after I got it and was planning to getting to the timing belt)... anyway... it took it a minute to come off; started "missing" and I was young and not sure what was going on... the car shut off and I rolled into a someone's driveway... car wouldn't do anyhting so we called in a tow... I guess because it didn't come off real violently I got lucky and it didn't damage anything that we noticed... ran just the same with a new belt...

I'm just saying you CAN get lucky... good luck.
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Old 03-29-2012, 01:56 PM
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Re: H22a4 Interference or Not?

So the dealership fixed the timing belt, and the car started right up. I don't hear valve noise, there is no rough idling, or lack of power. From all that is apparent, none of my valves have been bent. Just for the record - for people who might run into this post, my belt dropped at around 3k rpm, and i did not bend any valves. The dealership told me that one of the two bolts from the auto-tensioner was missing, undoubtedly a result of negligence on the part of my first mechanic, whom replaced the belt. With the issue of interference, while I have not been able to find the relevant technical data, to confirm my suspicion, I believe the H22A4 (and perhaps the H22 design, in general), is only an interference engine in the higher RPM band. Then again, it is possible that I got 'lucky', to some incalculable extent, and the inertial trajectory of the piston and the valves, were in receding harmony, as my timing belt deteriorated.

Last edited by zadeh79; 03-29-2012 at 03:25 PM.
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Old 03-29-2012, 08:10 PM
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Re: H22a4 Interference or Not?

I should have mentioned that mine came off (the h23) at lower engine speed too... It started "missing" but didn't cut off until I was rolling up to a stop sign....

Anyway... glad everything seems to be okay... you should have replaced that auto tensioner with an h23 manual tensioner (I had mine done a month ago on the h22... went with the manual...).
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Old 04-28-2014, 10:09 AM
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Re: H22a4 Interference or Not?

Thank you for*good*communication.
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