i have a question about "stronger" timing belts...

mainly, what is the exact reason a PE/Toda timing belt is recommended with "high lift" cams. is it because of increased RPM's the motor would be spinning at because the cams make power past the OEM redline of 8400 rpm? is it because the cams are going to make more power than stock cams?

thanks, chet

 

The Toda and Power Enterprises timing belts are designed for increased durability over the stock ones. For instance, where a stock timing belt can stretch during high rpm use and cause engine damage a Toda belt is designed specifically to reduce minor stretching and other imperfections that can cause failure of the timing belt.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chet &raquo;</TD></TR><TR><TD CLASS="quote">mainly, what is the exact reason a PE/Toda timing belt is recommended with "high lift" cams. is it because of increased RPM's the motor would be spinning at because the cams make power past the OEM redline of 8400 rpm? is it because the cams are going to make more power than stock cams?</TD></TR></TABLE>

Some of the added stress comes from the higher revs, but the majority can be attributed to the stiffer valvesprings used in such applications, and the fact that the larger cam lobes are exerting greater lift on the valves (and thus compressing the stiffer springs to a greater degree). All of this adds up to more stress on the timing belt.

 

A guy at one of my freinds shop was running toda spec b's with toda valve train, and ran a OEM belt. Within a few hundred miles, the belt shreaded, and the customer bent 8 valves. They pulled the head, replaced the valves and put a toda belt on, and had no more problems. Also, the guy from the shop said that the Toda belt was built perfectly, and with the toda cam gears, the tooths fit in each "groove" in the gear perfectly. On the honda belt, not every tooth will sit perfectly flush.

 

150 for pe belt &gt; head damage anyday ..