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  1. D

    Mazda 13b w/ Tracy Redrive

    To answer that we have to look to legend, back when we went from it being fairly "normal" for the mechanical OMP on the early cars to be rebuilt and no one thought anything of it. Then came the electronic OMP of the S5 FC RX7 and the S6-up FD RX7. The FC ecu would put the car into limp mode when...
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    Mazda 13b w/ Tracy Redrive

    The way I think it works- While I helped the development it was an engineer in Indianapolis that did the original theory and development- is more along the lines of using the pressure drop from the temperature drop as the exhaust gas expands into the chamber works to increase scavenging effect...
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    Mazda 13b w/ Tracy Redrive

    I just re-read my reply and it leaves a lot out. When we decided to race the RX8 in pro racing we picked it because it had been developed for US racing by Racing Beat and Speedsource with direct input and access with Mazda. I spoke to Jim Medere (miss that guy) at length about what they had...
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    Mazda 13b w/ Tracy Redrive

    We saw 224whp on a stock "keg" with the following: Racing Beat "race" ecu flash Custom (we made them) alternator and water pump pulleys Tuned air intake- we basically sat on the dyno and lengthened/ shortened/ tried various diameters and transitions- the intake tube and air filter The...
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    Mazda 13b w/ Tracy Redrive

    The Renny in stock-ish form is less responsive to intake and exhaust modifications because the engineers at Mazda did an exceptional job with the variable length intake/6th ports and the stock exhaust. That said, the renessis responds even more like a 2-stroke than other 13Bs and exhaust is...
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    Mazda 13b w/ Tracy Redrive

    Neil Unger the fellow making redrives in Oz has (as of a couple months ago) a 3.17 redrive based around Tracys design sitting in Colorado for sale, brand new. I am very strongly leaning towards the Marcotte PSRU myself, as it seems the most viable at this time. I have also considered...
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    Wanted Dragonfly templates

    Thanks!
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    Wanted Dragonfly templates

    My Dragonfly project came with built wings, canard, and fin, and it seems that along the way either the control surfaces were built then lost, or the templates did not follow the project. Thus I am in need of the templates for the ailerons, elevators, and rudder for a Viking Dragonfly, which...
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    Spark redundancy.

    I like the vagueness and "seems like". It IS hard to provide hard numbers to compare the rotary efficiency vs the Lyc because being honest, there is a serious lack of consistency between builds. MY build will very likely result in a configuration that compared with a Lyc of equal performance...
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    Hi Lendich, I'm Don, easily found on Facebook. My email is dwalker.930@gmail.com

    Hi Lendich, I'm Don, easily found on Facebook. My email is dwalker.930@gmail.com
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    How many people are interested in a GOOD safe psru for the rotary?

    My concern with any type of P-Port is they tend to leak. Even if they are steel and welded in place to the steel liner, over time the weld can crack. The aluminum press fit, stepped, and sealed full P-port setups have gotten very reliable these days. Even so, I am strongly considering not using...
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    My 13B engine configuration (tentative)

    So to put some context to the parts, now that I have a few minutes and am winding down, I can share my thought process here. First, I am using the Semi-P-Port irons because I have them and they are exceedingly well done. They were done for a race engine that never happened, and *should* work...
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    Hello

    I actually keep meaning to go, and have driven by it several times with no time to stop. It is for sure on the list.
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    Spark redundancy.

    I spent a couple of decades breaking misconceptions and "common knowledge", so I can relate.
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    Hello

    Middle Tennessee, in Murfreesboro near the Murfreesboro Airport (MBT)
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    Hello

    I am in Tennessee
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    Spark redundancy.

    I am curious why you think any Lycoming is anywhere near efficient as a modern engine as described. I have limited experience with the cutting edge Lycosaurs, so am willing to be educated here, but my understanding is they are in no way an example of efficiency.
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    Spark redundancy.

    Why do you think that?
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    Flywheel drive with starter on pulley end?

    The type 4 he was using a flywheel on the flywheel end and a prop extension to allow for the sleek nose
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    Flywheel drive with starter on pulley end?

    Which picture?
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