Twins with Twins, Anyone?

kidturbo

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Jul 20, 2010
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Yeah those carp are fresh water. Making their way up the Mississippi and Ohio Rivers currently, and hell on bass boat occupants.

Source: https://youtu.be/TtfnUtm6GpI


But that did made me look up what would happen if one landed in the turbo..

Source: https://youtu.be/itnT-v-Fm8Y?t=145


As for the drives, gonna flush and fill em again, then change the clamps on bellows to a T-bolt style and give em one more try to at least get some prop shaft height video. Then we gonna let someone else play with those, and go back to Mercury #6 drives like they had origionally. Issues is, the gearset we need costs 5k per side, and never came factory..
 
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kidturbo

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Guess who exploded another 12mil yesterday??

Houston we have a small issue.. Counting dyno time before the hour meters were added, both pumps likely failed within runtime minutes of each other. Port engine had a few more dyno pull days than Stbd.

Guess gonna have to get technical on it again.. lol

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kidturbo

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Jul 20, 2010
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I spent last 3 days speaking with ever BOSCH specialist I know of. Consensus is the oversize plunger raises the load on the cam followers exponentially. While this may not be a problem on trucks, the high sustained RPM goes into the realm of unknown on the strokers. Lubrication or heat, or a combination is obviously the cause, but I've yet to gather any data.

Randy from Exergy is bringing me a 12mil pump Monday, and we will give it another swing, with some lube added. Also going to put the IR camera to work and log some temps on feeds, rails and returns at speed. That and regulator duty cycle is what they all wanta know. Hopefully we can all learn something from this.

The other consensus from the pros, go back to a dual stock CP3 setup and call it done. Since these already run an electric water pump, just move the fuse block and hour meter, bolt one up in minutes..


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kidturbo

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Ah yeah, these track day air filters work great. If anything it responds better with them on. Or I'm just getting heavy handed on the sticks and think it's better. Either way, started shifting them at 4500R now and they bark the tires every time..

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Bdsankey

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I wonder what is taking these down? You're not running any crazy RPM that a drag truck or puller doesn't see unless the issue is sustaining that for hours at a time?
 

zakkb787

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Sep 29, 2014
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I wonder what is taking these down? You're not running any crazy RPM that a drag truck or puller doesn't see unless the issue is sustaining that for hours at a time?
I could definitely see the high sustained RPMs being a huge concern and issue. 4500rpm is still a chunk. Puller trucks and drag trucks are only 10-20 second high rpm stress at a time. I could definitely see the added heat cycles of running 4K+ RPMs sustained for 10 minutes or more (probably more along the lines of hours) possibly causing stress cracks or failures just due to the pumps not necessarily being designed for that sort of heat and abuse in gears and bearings inside.
 

Bdsankey

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I could definitely see the high sustained RPMs being a huge concern and issue. 4500rpm is still a chunk. Puller trucks and drag trucks are only 10-20 second high rpm stress at a time. I could definitely see the added heat cycles of running 4K+ RPMs sustained for 10 minutes or more (probably more along the lines of hours) possibly causing stress cracks or failures just due to the pumps not necessarily being designed for that sort of heat and abuse in gears and bearings inside.
I agree on it being a few seconds at a time which leads me to believe it's the sustained RPM. Without tearing the pumps down it's going to be hard to know the root cause of the failures (IE is the suction side or is it killing plungers etc). Any chance of fuel contamination causing lack of lubricity?
 

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