Lost rpm
#61
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Location: Ballston Spa, New York
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These are 540's with M1 Prochargers? I'm shocked that they make any boost.
Out of curiosity, what did they dyno?
I can't wait to hear the fix.
I leak tested an engine a bit ago and it leaked down good. When the heads were removed it was missing part of the pistons I believe on the exhaust side. Engine was down a little on power, but nothing that would have said tops of pistons melted.
Out of curiosity, what did they dyno?
I can't wait to hear the fix.
I leak tested an engine a bit ago and it leaked down good. When the heads were removed it was missing part of the pistons I believe on the exhaust side. Engine was down a little on power, but nothing that would have said tops of pistons melted.
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Rookie (07-12-2021)
#62
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So I ran smaller props over the weekend to get more rpm and spin the Prochargers faster. Got it up to around 4800 rpm and the boost gauges actually show about 5+ inches of vacuum! How's that even possible?
#64
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To me the only way thats possible at all (provided that the boost/vacuum gauges are both accurate) Is that theres something internally wrong with either charger, or theres a boost leak in both systems. If your building the engine RPM which your are you should most definitely be building boost. The weirdest thing about your problem is your having the issue with both motors. What did procharger say when you contacted them? How does your setup work on yours? As in airflow... charger, intercooler then into the plenum? Have you tried pulling one of the connections and verified positive airflow?
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SB (07-13-2021)
#66
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Have you pulled the pulleys off each charger and inspected the keyway? Long shot but maybe slipping under load/high rpm if keyway is wore/key broke?? Very odd and confusing problem for dam sure, Almost at a loss and makes zero sense as to why it would be pulling a vacuum at high rpm when theres positive airflow at idle
#67
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resurrected (07-13-2021)
#68
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If it we’re mine, I’d swap the chargers, inter coolers and ducting between the 2
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