Hi,
So, I strapped one of my cars on a dyno expecting "big numbers" or at the
very least bigger numbers than what I had seen before. Assuming things
like 12:1 compression and proper cam timing, I should def. see 150 fwhp
and that should translate to maybe 130 at the wheels. I eventually got
there (135.8 to the wheels), but less than what I really want.
So, where did we go wrong?
I took the motor apart a couple of weeks ago. Bear in mind that I need to
start driving this car in a week or so from now. The "tradition"
continues, e.g. Bob starts major car repair / improvement just before
needing to use said vehicle. I think I like the excitement of the
last-minute "gotta get 'er done" thing.
At any rate, 12:1 should mean roughly 36 cc combustion chambers. Note -
that includes the head gasket. Fearing that taking off too much head
material, I cut the head to 3.315". That should have been 3.295 according
to the TR6 Comp. Prep book.
Turns out I was waaaaay too conservative. I measured the head w/o the
gasket and I have 38cc chambers. Add the gasket (and factor out a tad due
to the dome pistons), and we're close to 41cc chambers. Even with a .040
overbore, this is something like 10.4 or 10.5:1...
So, I'm making the exact amount of power that I should be making
considering all the parts of the system.
Oh well. I'll put that motor back together and go to plan B which is to
finish the other motor. That one is def. over 12:1!!
In the words of H, Simpson...
DOH!
On the plus side, I def. don't need 110 octane fuel with what I have right
now. :-)
rml
p.s. having a burrette is awesome. CC'ing the heads is a 20 min job and
well worth it if you take the time.
---------------------------------------------------------------------------
Bob Lang NER/SCCA | This space for rent
Solo Chair 2008 TR6 40 F Prepared | Triumph!
Voice:781-438-2568 FAX: 617-258-9535 | Cell: 339-927-4489
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