Carrera Throttle Rod Trivia

Discussion of 4-Cam Type 547 engines (and all the Fuhrmann racing variants) and cars that powered them.
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Bill Sargent
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Tag: Faux-Cam
Location: Seattle, Washington

Carrera Throttle Rod Trivia

#1 Post by Bill Sargent » Mon May 24, 2021 6:50 pm

356s with a 4 cam motor that use the high throttle linkage cross bar rearward of the motor use a throttle rod that is longer than the one used on pushrod cars. This is the rod that extends from the bel crank on the transmission to the throttle linkage cross rod. The length of rod needed depends on how many 5mm spacers are used between the motor and transmission. Spacers are used to have the starter gear engage the flywheel ring gear at the correct depth.

A stock Carrera 2 used 1 x 5 mm spacer between the motor and transmission. The throttle rod is 867mm long.

If a 904 flywheel is used then 2 x 5 mm spacers are needed between the motor and transmission. The throttle rod for this application is 877mm long.

Classic Parts in Germany sells a special flywheel 4 cam flywheel that requires no spacer between motor and transmission and allows use of the stock 200 mm C/SC clutch parts. The throttle rod for this application is 855mm long.
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Carrera throttle rods.
3FC27A93-1CBB-42E7-83BF-2DB9E85A94BE.jpeg (360.41 KiB) Viewed 1054 times
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Carrera throttle rod details
C6B45ACA-F397-44D4-ADE0-1FB2BCA493AD.jpeg (419.06 KiB) Viewed 1054 times
Most vendors sell only the 867mm length for a stock Carrera 2. When this version is used with 2 spacers between the motor and transmission only 3 or 4 threads of the ball socket can be engaged, and only if the drop lengths are adjusted to the max. Likewise when using the classic Parts flywheel with no spacer between the motor and transmission the ball socket cannot be screwed on far enough and some threads need to be cut off.

PR Services in the UK will make custom length throttle rods for anyone that needs one. Last one I ordered made it from Essex in the UK to Seattle, USA in 4 days. Great service!
Regards,

Bill Sargent
#151489 59A Cab
#159176 64C Cab
#460603 67 912
904 clone in the works

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Martin Benade
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Location: Cleveland, Ohio

Re: Carrera Throttle Rod Trivia

#2 Post by Martin Benade » Mon May 24, 2021 8:26 pm

Why does the rod length increase by about double the spacer’s thickness?
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Bill Sargent
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Joined: Thu Apr 10, 2008 11:03 am
Tag: Faux-Cam
Location: Seattle, Washington

Re: Carrera Throttle Rod Trivia

#3 Post by Bill Sargent » Mon May 24, 2021 9:46 pm

The rod length increases by more than the spacer thickness change because the rod runs at an upward angle of about 45 degrees from the transmission.
Regards,

Bill Sargent
#151489 59A Cab
#159176 64C Cab
#460603 67 912
904 clone in the works

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Harlan Halsey
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Joined: Fri Mar 02, 2012 2:05 pm
Location: No Cal SF Peninsula

Re: Carrera Throttle Rod Trivia

#4 Post by Harlan Halsey » Tue May 25, 2021 4:19 am

I'm much too impatient to wait for a shipment. Don't tell anybody but I've always made my own out of welding rod. :D

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