Project Fredybender V2.1 : NA with an attitude for the track by fredybender

3 minute(s) of a 234 minute read

Space for parts is now at a premium in here...So I thought that my wheels & tires would blend in my son's room, the way its decorated they actually look good in there!

Engine mounts, struts, spindles, and spring perch all sandblasted, and now painted...

11-29-10

I helped out a friend with Mk1 golf, building a certifiable 8 pt roll cage on the week end, looks good! My car is up next, and if the stars line up OK, the week end of December 20th is the "roll cage week end" for Dagomar.

I have since finished up a few tidbits here & there, but mostly attacked the engine, and the calculations of compression height, deck clearance, valve clearance, head CC's, piston dome CC's, compression ratio according to which fuel to run, all based on the CC's, and needed head gasket thickness, Max connecting rod load, for reaching the max RPM taking in consideration Max HP @ X RPM ... Also calculating dynamic compression with cam timing. 

Interesting enough, the big valve kit from TT, when installed, has increased the combustion chamber to 50cc's from the stock 43 CC's usually encountered; this can be explained by the height of the valve faces changing thus increasing volume, and also the clearance of the new seats in the chamber has also increased volume of the combustion chamber.

So for all you guys & gals out there taking a look at a big valve kit, if you increase your combustion chamber volume by that much, the HP gains will NEVER be seen, if the true to life, measured compression ratio is not calculated, and adjusted either with pistons, or shaving head/ block and adding gasket thickness!

I will have a 2.97mm thick head gasket, which will give me a 13.05 STATIC compression ratio with my Wossner ABF pistons rated at 12.4 compression. (Stock is 1.6mm, but I have a TD crank that makes the piston go 1.35mm higher)

this equates to 220 psi at the end of the compression stroke (Avgas 100LL is rated for 220 )

This in turn, should yield interesting power numbers... But I might need a diesel starter 

I will be posting pics, soon, as I am machining some components; for taking off weight on internal moving parts