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mnemonix wrote:I've never run a gauge anywhere but in the inlet manifold.
The reasons you mention for having it immediately after the supercharger are valid. However we're talking about a $400 used supercharger here, not a big dollar 8/71. This offsets a lot of the reasons you mention.
You can avoid pressure spikes with a properly configured bypass valve + recirculating blowoff valve.
Much better to measure pressure in the inlet manifold to see what boost your engine is recieving, after losses from intercooler/pipework etc.
If you observe a pressure decrease under rev's with the gauge at the SC, you'll still witness it when measuring pressure at the manifold.
8/71 blowers are not that dear if you know where to look.
72 series detroits run them on their N/A two stroke diesels. (Although they have the blower the engine is still N/A as the blower is only there for scavaging. And the engine only ever has atmospheric pressure in it as the exhaust valves only close after the intake port is covered) I have one int he shed somewhere, thinking about putting it on the 6.5l chev diesel in the 60......maybe one day.
As for your boost guage, the manifold is the place to be. Also, with the selectable dog clutch you are using, do you have a bypass for the air intake when you are not running the s/c?
mnemonix wrote:I've never run a gauge anywhere but in the inlet manifold.
The reasons you mention for having it immediately after the supercharger are valid. However we're talking about a $400 used supercharger here, not a big dollar 8/71. This offsets a lot of the reasons you mention.
You can avoid pressure spikes with a properly configured bypass valve + recirculating blowoff valve.
Much better to measure pressure in the inlet manifold to see what boost your engine is recieving, after losses from intercooler/pipework etc.
If you observe a pressure decrease under rev's with the gauge at the SC, you'll still witness it when measuring pressure at the manifold.
8/71 blowers are not that dear if you know where to look.
72 series detroits run them on their N/A two stroke diesels. (Although they have the blower the engine is still N/A as the blower is only there for scavaging. And the engine only ever has atmospheric pressure in it as the exhaust valves only close after the intake port is covered) I have one int he shed somewhere, thinking about putting it on the 6.5l chev diesel in the 60......maybe one day.
As for your boost guage, the manifold is the place to be. Also, with the selectable dog clutch you are using, do you have a bypass for the air intake when you are not running the s/c?
No there is no need. It runs fine with the S/C off
Remember some days your the pigeon and other days your the statue
