1968 T.I.

[David White]

Could anyone tell me if there was a special distributor cap and rotor used on the T.I. set up?
My car is a L89.
Thanks
David

[Dave S.]

Re: 1968 T.I.

Distributor caps were the same for both ignition types. They use a D-308 Delco Remy Distributor cap. The embossing on the top varies from year to year so you will need to refer to your JG if you want to be NCRS correct. The only exception to my knowledge is that L-88 and possibly L-89 cars used a D-309 cap which is dark brown in color and has copper contacts.

[Dale Pearman]

Re: 1968 T.I.

Didn't the TI caps have terminals shorter than standard? Also is it correct that no "R" appeared in the top?

Dale.

[Dave S.]

Re: 1968 T.I.

Dale, As far as I know they all used the D-308 cap which would make the terminals the same for all. All the D-308 caps also have aluminum contacts. Patent Pending w/ R is correct for all 70-72 Corvettes including those w/ TI which was available through 1971. I would say Patent number without the R would be correct for some 68 and/or 69 cars including those with TI.

[Dale Pearman]

Re: 1968 T.I.

So where was the short terminal no "R" cap used in production?

Dale.

[Dave S.]

Re: 1968 T.I.

Dale, Now, I get it. I was thinking terminal(inside the cap) and not tower(outside the cap). You are thinking of the D-310 short "tower" cap that was used on the Corvettes with fuel Injection. I guess the Corvette engineers felt the fuel cars needed clearance so they used the D-310 cap which has towers 3/8" shorter than the D-308. all other features are the same. In production the 63 thru 65 cars would be Patent Pending without the R whether they had a D-308 or D-309 or D-310 cap.

[Dale Pearman]

Re: 1968 T.I.

Thanks Dave.

Dale.

[Clem Z.]

Re: 1968 T.I.

was not there short and long contact for the rotors also? this makes for a closer distance from the rotor tip to the cap contact. the ones with a "E" were the shorter ones correct? "E" = emissions correct?

[Dale Pearman]

Correct *NM*

[Dave S.]

Re: 1968 T.I.

Clem, I my years dealing with Delco distributor caps I am not familiar with an "E" cap. Can you educate me on them???? Were they service only????

[Clem Z.]

Re: 1968 T.I.

they were std equiptment but i am not sure what year they started. they had a "E" stamped on the rotor tip. we replaced them with ACCELL that had the longer tip. when using HEIs for racing i made a fixture to bend the cap contacts in to be closer to the rotor tip. i think the extra distance was used for emission contol.

[Duke W.]

Re: 1968 T.I.

I don't buy the emission control theory. I suspect is has more to do with EMI control. The use of resistor type spark plugs began in '68, right? Is there a correlation between the use of resistor plugs and the short termimal rotor?

Duke