CIS System Adjustments & Valve Adjusting Screws
 

My 924 has sat for about two years and am in the process of getting it back so I can race it again.

Have drained and flushed the tank and fresh fuel is now in the system.

Cleaned the injectors along with the fuel distributor. Took the throttle body apart and cleaned.

Need to know the following initial settings before starting:

*Where should the throttle plate be in order not to bind in the bore and cause excessive idle rpm??? Number of turns??? Feeler gauge???

*How many turns out should the by pass screw from bottom??? 1 1/2, 2 turns????

*Air flow adjusting screw-initial number of turns from bottom??? Feeler gauge in bore???

Also; have never liked the valve adjustment on this engine with the one notch adjusters. Either seems to loose or too tight. Never a compromise.

Any advantage by going to the 3 or 4 notch adjusters?? Will they give better tolerances during adjustment???????

Cam and followers have only 10K mile which is a combo of street, DE and race mileage.

GLASEM,

This is from old memory, Will try to go through some old parts, info, etc when I get back from Kershaw next Monday.

Throttle Plate - I remember 924NA having a plate with 2 butterflies operating progressively, small butterfly opens first. I can't picture the links in my mind, but if you can put it in a vise or something & it opens & closes OK it should be fine. I would set the stop closed & adjust idle with the bypass screw starting 1 1/2 turns from bottom. If it is a 924T, It can be either the double or a single (like 944) butterfly. Be careful with the TPS switches. One contact should be closed at idle, breaking at about 15 degrees off opening & the other should close about 15 degrees before WOT. The single butterfly had both switches in one housing.

Valve adjusting screws - The ones with more notches are thicker on the taper so you don't have to run then in as far to get your clearance set right. This keeps you from running one in so far it goes through the lifter & damages the bore in the head.

I would do a new fuel filter also. If a turbo take your old one off & have it when getting a new one. There are two types, the fittings are different.

If no start, check your fuel distributor. It should be set so gas barely comes out of a disconnected line on top when the fuel pump is run.

drew1

Any luck?

Leaving town for a couple of days due to family matter. Found out when I got off work yesterday. Will check back Thurs or Friay if you need info from notes, etc.