96 Del Sol Si - Low comp after rebuild.
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96 Del Sol Si - Low comp after rebuild.
1996 USDM Civic Del Sol Si, Aftermarket intake, Yonaka Catback, OBD2 P28-A03, y8 head and harness, y5 bottom end.
So I have about 160mi on my motor, new OEM Majestic Honda Y8 head gasket, EngineTech STD rings, stock head, re-honed cyl walls. Previous owner starved the motor and I got it with the stock Y8 with no compression and rod knock. So I swapped the bottom end with a y5 and built it from there. I have low compression at the moment.
compression tests were done WOT, cold (not much of a change hot).
Dry
Cyl 1 130
Cyl 2 130
Cyl 3 135
Cyl 4 130
WetCyl 1 140
Cyl 2 140
Cyl 3 150
Cyl 4 155
Wondering if the compression rings are directional, bc my buddy installed them and neither of us saw a mark. As well, I am not confident that we clocked the rings correctly, (yes I have the diagram now). If that is so, is it too late to re-hone and reuse the current rings after checking correcting orientation and clock or should I buy a new set?
So I have about 160mi on my motor, new OEM Majestic Honda Y8 head gasket, EngineTech STD rings, stock head, re-honed cyl walls. Previous owner starved the motor and I got it with the stock Y8 with no compression and rod knock. So I swapped the bottom end with a y5 and built it from there. I have low compression at the moment.
compression tests were done WOT, cold (not much of a change hot).
Dry
Cyl 1 130
Cyl 2 130
Cyl 3 135
Cyl 4 130
WetCyl 1 140
Cyl 2 140
Cyl 3 150
Cyl 4 155
Wondering if the compression rings are directional, bc my buddy installed them and neither of us saw a mark. As well, I am not confident that we clocked the rings correctly, (yes I have the diagram now). If that is so, is it too late to re-hone and reuse the current rings after checking correcting orientation and clock or should I buy a new set?
Last edited by PolarBearLRG; Oct 13, 2021 at 07:58 PM.
Hysterically Calm
Joined: Jan 2013
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Re: 96 Del Sol Si - Low comp after rebuild.
The Y5 is the HX motor so I believe has a different piston/rod setup as well as a different piston to deck height etc. I suspect the HX had a lower compression setup in general compared to a Y8.
The Y7 block is the one that is pretty much inter-changable with the Y8. As such I believe you created a low compression motor by using a stock Y5 block to re-ring.
As for ring orientation it depends on the ring, some are tapered and should be put on one way, some are not and won't have a specific orientation. Clocking the rings, well what's done is done but I doubt it would create that much compression variance. You've already seated the rings so once again, what is done is done. You would have to start over if you were going to do more than just reclock the rings. i.e. turn the rings over to fix improper taper orientation.
Warning, honing again could put you past piston to wall clearance spec. You can only hone so much before it has to go oversized pistons and become a bore and hone done by a machine shop based on the new piston. New pistons are also best left to the machine shop to press off and on.
The Y7 block is the one that is pretty much inter-changable with the Y8. As such I believe you created a low compression motor by using a stock Y5 block to re-ring.
As for ring orientation it depends on the ring, some are tapered and should be put on one way, some are not and won't have a specific orientation. Clocking the rings, well what's done is done but I doubt it would create that much compression variance. You've already seated the rings so once again, what is done is done. You would have to start over if you were going to do more than just reclock the rings. i.e. turn the rings over to fix improper taper orientation.
Warning, honing again could put you past piston to wall clearance spec. You can only hone so much before it has to go oversized pistons and become a bore and hone done by a machine shop based on the new piston. New pistons are also best left to the machine shop to press off and on.
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Feb 20, 2014 08:49 PM