Which valve shims for 8-valve twinspark?

Run Amok · #1 (**permalink**) 06-22-2007, 11:13 AM

I need to adjust valve clearance on a 2.0 twinspark engine from the 75/Milano. Centerline Alfa (www.centerlinealfa.com) offers two shim styles: one for "750 or TS", and another for everything else.

Do I need the 750 shims for my engine??

Thanks for any guidance.

Bruce Colby · #2 (**permalink**) 06-22-2007, 12:52 PM

Quote:

Originally Posted by Run Amok

Do I need the 750 shims for my engine??

Run Amok · #3 (**permalink**) 06-22-2007, 01:18 PM

Thanks, Bruce...

I'll get the 750 shims -- I always try for at least 2/3 a$$

**kredden** · #4 (**permalink**) 06-23-2007, 05:57 AM

Make sure to measure the shims and not assume they are the correct size. Last time I ordered shims from there half of them were way off.

Kevin

Run Amok · #5 (**permalink**) 06-23-2007, 07:47 PM

Next question --

How can I tell if my current shims are the correct '750' shims? If they aren't, I want to order a full set of the correct type. Got a picture of the two types to compare??

The shims in my engine are 11.4 mm in diameter and have two rings machined around their circumference. Total height is 5 mm.

Mark Joerger
___________
Alfa TS powered Lotus 23B replica

han · #6 (**permalink**) 06-24-2007, 01:27 AM

you can also use the 9mm sims off 105/alfetta.

seen that done and they dont fall off.

.

Run Amok · #7 (**permalink**) 07-05-2007, 12:13 PM

I had some trouble finding official Alfa valve shimes in 8mm, but did find these alternates:

- Older Ducati 'bevel drive' motorcycles use 8mm valve adjuster caps - http://www.ducati-gowanloch.com/ in Australia has a good selection and will ship anywhere.

- Classic Lotus twincam engines used 9/32" and 5/16" cup-type valve shims.
In the USA, http://www.davebean.com/ was willing to caliper thier 5/16" shim selection to find shims that were a few thousandths large to fit 8mm shafts. Their selection is spotty, but they are nice people with which to deal. I got mine from them.