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PostPosted: Sat Apr 02, 2011 8:07 am 
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Joined: Wed Jan 14, 2004 8:45 pm
Posts: 2243
Adnoh, an educated guess is all I want or can ask for suggeted octane. don't worry about the timing, this Briggs Engine has mechanical adjustable timing and the MSD timing box too. that's a whole other ball of wax to figure out later, just going to leave it as is for now. More info to follow soon, need anything else too, let me know.

stock stroke....68mm
big bore....87.00mm Wiesco

lightened crank


piston skirt length...76.25mm
piston window port(intake side)...1.50" X .25"


exhaust spigot...51mm ID
base spacer plate...5.60mm
sleeve thickness...2.79mm


head info....twin plug NKG B9ES
inner dome width...69.73mm
outer dome width...87.00mm
inner dome volume...30ml/cc
outer dome volume...12ml/cc
total volume...42cc
squish... .0525"-.054"
squish angles...????
piston angles...????

The compression test yielded about 137-140 lbs which suprised me. I was expecting much higher. I also expected a lower CC dome. I still need to figure ring end gap and piston wall clearance(no feeler gages with me). Fresh hone and new rings might help compression, or just need to run it a bit to get them re-seated????


Attachments:
File comment: base plate w/ spray copper gasket
28 Mar 11 002 (Large).jpg
28 Mar 11 002 (Large).jpg [ 121.26 KiB | Viewed 3799 times ]
File comment: port windows BDC
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File comment: Engine side view
26 Mar 11 006 (Large).jpg
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File comment: TDC (Top Dead Center)
28 Mar 11 007 (Large).jpg
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File comment: Compression 137-140
28 Mar 11 014 (Large).jpg [81.37 KiB]
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28 Mar 11 008 (Large).jpg
28 Mar 11 008 (Large).jpg [ 96.3 KiB | Viewed 3799 times ]
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PostPosted: Sat Apr 02, 2011 8:15 am 
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Joined: Wed Jan 14, 2004 8:45 pm
Posts: 2243
more pics...

I added soy sauce to water for my CC measurements, so if you are smelling/thinking chineese food when riding with me, that's why! LMAO


Attachments:
File comment: squish
28 Mar 11 017 (Large).jpg [39.42 KiB]
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File comment: inner dome 30cc 69.73MM
28 Mar 11 019 (Large).jpg
28 Mar 11 019 (Large).jpg [ 92.17 KiB | Viewed 3798 times ]
File comment: outer dome 12CC more for a total of 42CC 87mm
28 Mar 11 020 (Large).jpg [72.81 KiB]
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File comment: side view
28 Mar 11 021 (Large).jpg [48.54 KiB]
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File comment: My hi-tech CC dispenser, ML are equal to CC, if you didnt know
28 Mar 11 022 (Large).jpg [73.66 KiB]
Downloaded 21 times
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