Good advice. I'd listen to Tom. Looks like you made some nice gains.steve cowan wrote: ↑Mon May 10, 2021 4:01 pmVery similar weather Chad,our racing season is march to September, to hot and humid for me otherwiseCGT wrote: ↑Mon May 10, 2021 2:35 pmOh I see that now . Your previous bests....were they in similar weather?steve cowan wrote: ↑Mon May 10, 2021 1:17 pm 1 st pass 2344DA
2nd pass 2047DA
full weather sample on bottom first page
Tom suggested backing the cam up a couple of degrees- should mph a couple more maybe
First valve job with stones
Moderator: Team
Re: First valve job with stones
Re: First valve job with stones
Nice times, great work.steve cowan wrote: ↑Sat May 08, 2021 3:47 pm Update-
Finally got to the track yesterday after a couple of false starts.
Car weighs 3650 with me
11.25:1 comp 383 010 block
Dart cast iron 165cc heads out to 182cc,1.94" - 1.5" valves
Flow 266 - 228 . 50 deg seat intake and exhaust.
Port matched Vic jnr,a bit of plenum work but more to be done.1" tapered spacer and shear plate.950hp carb
Howard's shelf solid roller
241-251 @ 0.050"
1.6 - 1.5 rockers.600"-570" lift
108 lsa in at 104.
1 5/8" tri-y headers
Testing with 30% MS 109/ pump
Turbo 400 with 8"5600 converter
9" rear gear 4.1:1 255/60/15 radials.
20210508_170042.jpg
Sampled weather-
82F,29.73",56%H,2344DA,91GOW,0.614VP,64.6DP,1.053CF.
20210508_183134.jpg
79F,29.77",59%H,2087DA,87GOW,0.586VP,63.3DP,1.046CF.
First pass is with 30deg timing,shift points 6500 1st ,7000 2nd.AFR reading 11.7 plugs show a bit rich.
2nd pass 34 deg timing, dropped fuel pressure to 5psi from 5 3/4psi,shift points 6000 - 6800 and finish line 6500rpm
AFR shows 12.6 .
I am pretty happy with results considering how basic the engine is and my skill level as a engine guy,plenty of things to try,spacers. Different headers and exhaust, more intake manifold porting, different fuel ratios,go to 4.5 rear gear,different drag radials etc
Any comments welcome.
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Re: First valve job with stones
I'm curious about the equipment, also. I have some Black & Decker equipment, including stones but like the idea of using the air or electric die grinder instead. Maybe you can forward me the pm on this if you don't want to post it.steve cowan wrote: ↑Mon May 10, 2021 5:16 amJed,jed wrote: ↑Sun May 09, 2021 2:11 pm I guess I'm a little out of touch with seat grinding equipment. You stated you use "live pilot and adjustable clutch stone holder"
I have not heard of using eather when grinding seats. I'm only familiar with Souix and Kwik Way. can you reference manufactures of the the pilots and stone holder, also you show a air driver and a Milwaukee cordless driver.
Which one do you most use and prefer. I'm very interested in your equipment and manifactures and where to purchase them.
Good job on your project very impressive.
you can PM me if you wish I have more questions that others may not be interested in.
I will send you a PM next day or so
FYI to Jed: There's always going to be someone who'll be interested in other details that others won't be. I say post it all to the thread but I'll leave that up to Steve.