CMP fluids question ..........

[Phil Waterman]

Originally Posted by Bob Carriere

HI Phil

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Now get this..... it idles very low and steady at around -10 inch vacuum.....38 pounds oil never above 150 Degree F....... revs up real fast to about -22 inches vacuum.... Dizzy travels well with the vacuum advance..... at speed it reaches 42/44 on the oil.....

Should the vacuum be that low.....??

Old hot rod guy down the road has the old dwell meter gauge which I hope to coach him on showing me how to optimize the settings...

Any suggestions...?
....

Bob

Hi Bob

Checked my notes from the test stand running of 261 and 235

Concerning oil pressure- Only time I saw oil pressure under 30 PSI was when the engine temperature was 190+ with oil temperature above 170 and RPMs down to 400 RPM. At 300 RPM it got down to 24 PSI.

Concerning vacuum I'm getting 22 inchs at idle 400-500 RPM, running down the highway at indicated 50 MPH on flat ground I'm seeing 5-7 inches. Max vacuum under deceleration is 27-28 inchs.

Just discovered that coil position with the 261 in a Pattern 13 and stock coil holder has the coil hard against the side of the dog house. Which seems to add noise to the cab.

As to your comment about the 216 vs 261 thermostat water outlet to the radiator, looked back at my flow testing notes on the 261 engine running stock 261 water pump and outlet vs 261 engine with 216 pump and thermostat. There doesn't looked to be a measurable difference. I believe that the thermostat is the flow restriction that is really controlling flow through the radiator. One point though in getting the 261 engine to come up to temperature smoothly it looks like this engine really needs to have a connection between the inlet ant outlet for the heater. I installed a 3/8th copper U between this seems to keep the flow going through the engine so that the hot water actually gets to the thermostat. See picture