made a chart of each stock engine's port duration/overlap
#1
made a chart of each stock engine's port duration/overlap
Here's a chart with the duration and overlap for series 4 Rx-7 through Series 2 Rx-8, including 4 and 6 port engines:
I used this calculator: http://www.wallaceracing.com/camcalc.php
and here's the source material:
series 4
series 5
series 6
series 1 and 2 Rx-8
I used this calculator: http://www.wallaceracing.com/camcalc.php
and here's the source material:
series 4
series 5
series 6
series 1 and 2 Rx-8
#2
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sweet! i did that on the last HD, but i looked up the timings of the early 10a, and the PP's as well.
since its lost, i don't recall exact numbers but the PP is like 330/303 or something, its like the rx8 in terms of the intake/exhaust timing relationship.
since its lost, i don't recall exact numbers but the PP is like 330/303 or something, its like the rx8 in terms of the intake/exhaust timing relationship.
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actually http://foxed.ca/foxed/index.php?page=rx7manual he's added some new ones
#5
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Are you sure that "ATDC" means "AfterTDC" and not "AboveTDC"? It seems odd that there'd be such a large difference in the port durations between the FC and FD motors when the ports don't look that much different.
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you're right though, typo on the FD?
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#10
I thought it was a typo myself, but I cross referenced all the sources and the numbers were the same. The FD port timing is much different from the FC turbo motors. I wish I had specs on the Cosmo 2 and 3 rotor engines.
93 FSM
93 service highlights
94 FSM
#11
just looking at some of those other links that have been posted here... all those other sources seem to think that the opening time of the FD ports are similar to the FC ports, even though the service manuals say otherwise.
And here is a diagram out of the Renesis SAE paper, and it lists the FD as having 16 degrees of overlap (just like the 13BT). So maybe it was a typo that was propagated throughout Mazda's documents at the time.
And here is a diagram out of the Renesis SAE paper, and it lists the FD as having 16 degrees of overlap (just like the 13BT). So maybe it was a typo that was propagated throughout Mazda's documents at the time.
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can't believe i missed the ATDC/BTDC changeover though...
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