'07 findings

[Biggzed]

Mike -

I read on another thread here a while ago you were hoping to have some '07 engine packages up shortly. Any update there? I am really curious to see your findings on tuning issues/corrections with the stock bikes, stage 1 upgrades, and of course big bore/head combos.

I have also recently read on another forum where people are finding the squish (or quench - not sure of the correct term) on the stock 96" engine is alarmingly bad. One high profile professional builder, measured a stock '07 Street Glide at .074" on the rear and .079" on the front. Sounds like this could be a major area for improvement. Have you found anything simliar?

Thanks,
BZ

[Mike]

We have our packages ready with cylinders, pistons, cams and heads for our 103 and 110 combo's. Some dyno data but more coming very soon. Racing season is now over for a bit and hopefully I'll catch up on updating the dyno library with these results. So far, with good heads, cams, etc. we are easily getting 120hp/114tq for the 103. We are doing a similar 110, a max effort 113, a 107 and at least 2 more 103's. Our 07 production throttlebody is due for release in feb. 07 and hope to see even better numbers when used with similar builds. We are finding (as others, see Hal's web site) the 07's show lower hp numbers on the dyno than earlier models. This was predicted as a function of the 6 speed trans and regeared primary. Results do tend to agree with earlier models running 6speed trans.
The quench should be the heads gasket thickness, it the piston deck is even with the cylinder. The head still retains the semi bathtub chamber as earlier models, which incorporates a flat quench area on either side as part of the gasket surface. Those motors we have tore down, so far, have been coming up even on deck. The head gasket is still .045 (crushed), so quench would be the normal (for H-D) .045. Generally, .020-.025 is the best quench but with the motor growth, piston rock and rod stretch (at high rpm's) in an H-D motor, we need .030+ to prevent piston contact with the heads. If the piston is found to be below the cylinder deck, this can easily be corrected by turning the cylinder base on a lathe to bring the piston to zero deck. Since the motor is designed to be this way, you'll also be correcting the compression ratio. Thanks for the info. on this and I'll be checking stock motors more in the future.
Mike