the swallow tail project has begun.......

[16v_kid]

[16v_kid]

What camera do you use?

[rayray086]

Woohoo for updates! Love how the arches look.

[Preen59]

Lets hear it for progress! Lovely mate. Lovely.

[nick_sixx]

Just read through this entire thread....i need updates or i'll get the shakes...

[alex g]

got about taking the motor apart to send to rams head, looks so nice and clean im wondering why.it was fully rebuilt before i bought (valves cut and a cast clean)it and hasnt turned a stroke, but for the numbers and style of motor i am building i need an serious head job and valve treatment, looking to the pistons which have been fitted with gapless seals, there are marking on the top just wondering if any one can make sense of them??

81 98
sp. 0,03
$(well a symbol similar to a dollar sign)gs1 29

i presume the middle line is manufure date and the top engine years?? but the bottom line is a little interesting, maybe brand?? how can i check the size, is it as easy as measuring the bore???

gee the schrick pan make standing the bottom end up easy









and some winders i made up featuring nylon knobs

[Water Boy]

Looks good are you still going to run N/A?

I hope youré only running gaples seals on the second compression ring.

[Preen59]

81mm is standard bore. So 81 may be the piston size. The "bore size" is actually the piston size. The bore will be slightly larger (bore clearance etc, you know). Just measure the bore with a set of vernier calipers at the top. That will tell you what bore size it is. The standard sizes go from 81mm and up in 0.5mm increments to 83mm.

If the engine was reconditioned i'd be surprised if it was standard bore, however it may have not done a lot of work before reconditioning.

I hope that made sense.

[alex g]

i am still running n/a yes,turns out the bore size is 82mm so could be 81 piston

[Preen59]

i am still running n/a yes,turns out the bore size is 82mm so could be 81 piston

40 thou piston to bore clearance? You'd be getting some serious piston slap and blow by! Our Nitro engine running CP forged blower pistons has 12 thou, and it's an inch larger bore!

I'm not sure what the "81" means, but its not your piston size.

[alex g]

i thought when you said sligthly larger it could have been half a mm a side , they also have clearance cuts for the valves


thanks for the help

its all a little new this internals stuff

[alex g]

[alex g]

[Preen59]

i thought when you said sligthly larger it could have been half a mm a side , they also have clearance cuts for the valves


thanks for the help

its all a little new this internals stuff

All good dude. By slightly larger i meant like .15mm or so. A bit hard to measure if you're not that great with calipers.

Everyone has to start somewhere, and you've got everything else down pat for sure, so start reading up on it.



Oh, PS, your block...

[alex g]

lightened and trued the intermediate shaft