Hey Guys, to start off, I searched high and low for this. I'm selling my car (h22 prelude), so I figured I'd do a compression test to prove that despite the high mileage, the engine has good compression. My problem is this; I remember having read something about unplugging a fuse for the ignition coil, but after searching, all i found was unplugging the fuse for the Fuel Injectors. So is this the only fuse I need to unplug, or is there indeed something about an ignition coil fuse?
Thanks!
-Lars

 

Yea i would suggest disconnecting your ignition coil. If you don't you could run the risk of blowing out the ignitor.

 

Well guys I did the test, and was surprised with the results. I was hopin for about 175 across all four cylinders. The car is a prelude vtec with an h22a1, 172k miles on the odometer. The results were as follows:

250-250-240-240.

What is the likely hood that an H22a1 with 172k miles would yield these results? Is there reason to believe it has been (re)built?

 

hahaha holy **** thats pretty much perfect

 

lol yeah I'm ecstatic, I really didn't expect a motor that I "know" or "think" to have 172k miles on it to yield those results, unless it was driven by a granny untill I got it lol. Especially the H22a1, with merely 10:1 CR. I looked through other people's results and didnt see a single stock motor with that kinda numbers.
So now I really wanna keep it and buy a DD, since I know the motor will last forever. If I sell it, I want more money for it.

 

i wouldn't say last forever but if maintance is done to it on time im sure it will last quiet some time

 

my apologies; "forever" was intended as an exaggeration, what i meant was "quite a while"

 

I'd be willing to bet a lot of that compression is from carbon build up. Take it to a good shop and have them do a 3 step induction service, then retest. You'll loose compression on paper, but you'll really notice a difference in performance

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by InvaderTrax &raquo;</TD></TR><TR><TD CLASS="quote">I'd be willing to bet a lot of that compression is from carbon build up. Take it to a good shop and have them do a 3 step induction service, then retest. You'll loose compression on paper, but you'll really notice a difference in performance</TD></TR></TABLE>

losing compression will never equal better performance. if you remember the basics of a engine, its a glorified air pump, it takes the energy of the combustion to push the cylinder down, if the compression is reduced, the energy will have else where ti escape to, thus reducing the force pushing down on the piston. so please explain to me how a reduction in compression, even with carbnon build up will improve perforamnce.

 

Those #s seem similar to mine.

Although my lude has a '92 H23 w/ 172k, I just pulled 240-240-235-238. Had about the same #s at the 120k mark too. The H series are damn good engines :D

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pos_cd5 &raquo;</TD></TR><TR><TD CLASS="quote">losing compression will never equal better performance. if you remember the basics of a engine, its a glorified air pump, it takes the energy of the combustion to push the cylinder down, if the compression is reduced, the energy will have else where ti escape to, thus reducing the force pushing down on the piston. so please explain to me how a reduction in compression, even with carbnon build up will improve perforamnce.</TD></TR></TABLE>

What he is saying is that since there is that much carbon build up in the chamber there most be alot other places. So by doing a carbon treat meant idle and performance will be gained other places like clean throttle body and intake and vlaves.

And yes there is a possibility that he will lose compression in doing so. But it doesn't mean he won't gain performance from the cleaning of the intake and throttle body and vlaves.