Post by
94teggy »
https://forums.nicoclub.com/94teggy-u3342.html
Tue Jun 17, 2003 2:00 pm
These are both from team-integra.net and are from a very respected guy on there who really knows his stuff...
Quote »The alleged damage to the engine is related to excessive vibration from the lack of dampening which then affects the bearings and other parts connected to the crankshaft like the oil pump. This extra vibrational effect happens over time not instantly. This is why there is a controversy in the first place. If it happened right away or close to the time you installed it, we'd all know that this is a nasty upgrade without a doubt. But it hasn't happened that way.
So if you experience pump failure or a spun bearing, was it due to the crank underpulley or was it the natural failure of a part being pushed at high performance over time? No one is going to be able to sort those out.
Many people, including Unorthodox, claim that the oil pump failures are not attributable to their product. The Honda oil pump gear is made of brittle powdered metal which warp under high loading over a long time and the gears begin to rub against the pump housing causing them to explode. The second explanation given regarding the Honda oil pump failures is related to the pump's backing plate and the lack of an extra screw in the Bseries ones (the H series oil pump's backing plates apparently have this extra screw). Under high load acceleration, the pump backing plate flexes and eventually buckles, which allows the brittle powdered metal oil pump gear to walk on the crankshaft snout and as soon as the pump gear moves, it binds with the oil pump housing and explodes. The last thing the pro-underpulley people blame is the loose factory clearance tolerances between the pump gear and the crankshaft.[/quote]
and
Quote »either you believe the honda crankshaft pulley is a harmonic balancer or you don't. If you don't, and many do not, then you would go ahead and buy one. But if you do and plan to run the engine hard in the upper rpms, you would avoid them like the plague...it all comes down to what you think is true.
I've heard arguments from very well respected people on both sides of the fence.
When smart people can't definitively agree on a point, then I tend to avoid the part altogether until someone can come up with a convincing proof to nullify the other side. To this day I have yet to hear one from either side proving to me beyond a shadow of a doubt that this is a risk free addition. So I look to other places for gains and leave well enough alone there.[/quote]
Now I'm not sure how much of that will apply to the SR but there's what I've heard about Hondas.
-Jon-