Outer Limits 4x4 Board

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?

Thanks Barbz This shot was taken a while ago. I will take a shot of the engine bay finished and send it to you

Chucky wrote:

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

Engine bay now finished, Some pics to follow soon I hope. Next is the suspension so the cross over steer will fit.

Here they are

Thanks mate