Need manifold pressure data

[odlee]

I have an RV 7, IO-360. cold air induction, one Lightspeed and a Harzell BA prop. On a ground static test to 2600 RPM, I see 23.9 " on the manifold gage, both manual and AFS 3500 digital. All fittings have been checked for leaks. The manual gage was teed into the system @ the engine. Doesn't seem high enough. Airport altitude is 700". What are you seeing and any suggestions or comments would be appreciated. I am already talking with Mattituck.

Thanks,
David

[Radomir]

David,

What's it reading when shut down? Should be altimeter setting - 1" per 1000 ft... (so just subtract 0.7 from current alt. setting in your case).. if it's wrong then.. I wouldn't expect it to get better when engine's running..

[odlee]

Radomir, it reads atmospheric less the altitude adjustment.

[mannanj]

At full wide open throttle at 700 above msl, you should be seeing about 28-29 inches. I'm just guessing that you're not at full throttle.?????????