A 73.5 CIS Question
 

Ok, I'm a renegade from the 914 ranks...../6 conversion with a 73.5 2.4L CIS engine. Couple of questions:

1.) The throttle control valve is bypassing pressure (leaking). How critical is this component to the overall running of the engine?

2.) Has anyone ever converted a '73.5 system to the later throttle body with no control valve and vacuum operated warm up regulator? Is it possible?

All of this work is leading to solving a problem with oil temps. The engine peaks out at about 270 degrees on the oil. Head temp never sees above 325 degrees ...... yes, I have an external cooler to add on but am making sure everything else is hoookay dokay before I add it.

The '72 - '73 spec book lists 130°C [266°F] as max oil temp, so you have some serious oil system problems, there!!!

Are you sure that you have the sheet metal fitting the body [914, I presume?] properly, such that intake air is coming from above and not contaminated by exhausted air from the cylinders and exhaust??? Ingesting hot, preheated air can cause just the oil temp spike you are seeing.

Hey thanks ..... Think I solved one problem. The engine DAPO had plumbed the control valve (TPS) to the return fuel line as it apparently has an internal leak. It is supposed to be plumbed to a vacuum port on the throttle body. Go figure ......

Yes, I have the repro engine tin fully in place.

I am beginning to think the oil temp problem is an internal engine problem. Will see how the engine runs with the CIS plumbed and functioning correctly.

Gad, I love projects .......

pull out the oil thermostat on the back of the motor, u can put it in boiling water to check it. i think there are a lot of people out there trying to fix hot cars with external oil coolers when the problem may be the thermo. also, make sure the fins for the engine mounted cooler are clean and flowing air, along with clean cylinder fins. a stock engine should run cool...unless something is bad.
just replaced my thermo in a 2.7s...180 to 190 deg and holding!

pull out the oil thermostat on the back of the motor, u can put it in boiling water to check it. i think there are a lot of people out there trying to fix hot cars with external oil coolers when the problem may be the thermo. also, make sure the fins for the engine mounted cooler are clean and flowing air, along with clean cylinder fins. a stock engine should run cool...unless something is bad.
just replaced my thermo in a 2.7s...180 to 190 deg and holding!