Last year I had the engine in my GX swapped. I didn't realize the shop (non-dealer) put in a D17A1 block until I was looking to swap the head for a rebuilt due to problems I'm currently having.
As far as I can tell, the major difference is the compression (9.5:1 vs 12.5:1). As this is a much more techy level than I am savvy at, I really need the advice from the more savvy folks.
First off, was this an acceptable swap? The engine has always been rough since he put it in, and Honda insisted it was a bad engine mount, but it didn't clear up when I replaced the mount.
Second, and forgive the details as I don't know which facts are relevant and want to provide as much as I can.
It went for about 10 months just fine (about 36 highway mpg), then at the end of October I started losing power. I took it in for an oil change and he said the oil was filthy. I swapped the plugs (the ones that were in the engine were resister plugs, were carbon fouled, and looked burnt on the ceramic), and replaced what looked like a bad coil. It's been 3K miles since then, and the oil looks clean on the stick, but the power has continued to decline. Compression was about 140-150 on all 4 cylinders when I tested, but a mechanic friend said it was 200 on a wet test and that it was supposed to be 250, which had me thinking I lost compression. But that doesn't seem to jive now that I've seen the block is a D17A1 and 140-150 is actually pretty good.
I'm not burning oil, and until recently even the temp never even touched the halfway mark. However, as lately I'm running in the 3K revs to maintain 35-40 mph, it's started to creep up to about 65% on the gauge.
So there you have it... all my sordid details. If the D17A1 block was bad for the CNG, how did it manage to run for 10 mos, and what can I replace to buy another 10 mos? I really gotta keep costs down, cause that alimnony ain't gonna pay itself...
As far as I can tell, the major difference is the compression (9.5:1 vs 12.5:1). As this is a much more techy level than I am savvy at, I really need the advice from the more savvy folks.
First off, was this an acceptable swap? The engine has always been rough since he put it in, and Honda insisted it was a bad engine mount, but it didn't clear up when I replaced the mount.
Second, and forgive the details as I don't know which facts are relevant and want to provide as much as I can.
It went for about 10 months just fine (about 36 highway mpg), then at the end of October I started losing power. I took it in for an oil change and he said the oil was filthy. I swapped the plugs (the ones that were in the engine were resister plugs, were carbon fouled, and looked burnt on the ceramic), and replaced what looked like a bad coil. It's been 3K miles since then, and the oil looks clean on the stick, but the power has continued to decline. Compression was about 140-150 on all 4 cylinders when I tested, but a mechanic friend said it was 200 on a wet test and that it was supposed to be 250, which had me thinking I lost compression. But that doesn't seem to jive now that I've seen the block is a D17A1 and 140-150 is actually pretty good.
I'm not burning oil, and until recently even the temp never even touched the halfway mark. However, as lately I'm running in the 3K revs to maintain 35-40 mph, it's started to creep up to about 65% on the gauge.
So there you have it... all my sordid details. If the D17A1 block was bad for the CNG, how did it manage to run for 10 mos, and what can I replace to buy another 10 mos? I really gotta keep costs down, cause that alimnony ain't gonna pay itself...