Biggest tillotson yet !!! 80.37mm WOW ! 300cc bottom end , Paulskarts.com

[@Daniel-zw2hx]

Hey Paul. Could you please upload a video of the 300cc tillotson running. Im a potential customer. Tha ks

[@paulskartslifan4206]

😎👍

[@freeradical6390]

Watch out for Wisco pistons and tight bores....we would make the bore a few tho bigger than normal in MX for Wisco cause they expand more and tend to seize compared to a Pro-x piston.jmo Beautiful looking motor you built their!!!

[@paulskartslifan4206]

Yea tight is only good in the bedroom 🤣💪

[@frederickwoods5943]

freeradical6390 I just built a bike engine with Weisco 83.5mm pistons and we set piston-cylinder liner clearance at .003, was told I could run ring-gap at .014 so I went with a "loose 14" about. 0145-inch. Bike has 8,000 miles so far. Do those numbers sound OK with the limited info ... trying to respect Paul's thread

[@freeradical6390]

@@frederickwoods5943 Id ask a machinist- Paul. It was a long time ago for me. The difference came between cast and forged, forged needing a little more room than "stock" cast piston. Ring gap? too much is always better than not enough.

[@frederickwoods5943]

Thanks for stating the exact bore size, 80.37mm and a 59mm stroke is 299.32 cc if the stroke is 59; I had heard that some cranks were 59+, don't know if any truth to that. People will be putting these on homebuilt aircraft 😊

[@aaron7520]

Its 296.3cc (297cc) because its the ARC 2.3" billet crank. Either he did math wrong claiming 301cc or just sales tactics.

[@frederickwoods5943]

@@aaron7520 thanks for the clarification, makes sense.

[@Strict30]

Wow

[@boosted.]

Hey Paul, what’s the Upper RPM range this short block can turn and still be happy.

[@paulskartslifan4206]

Engine math says the bigger the piston in relationship to the stroke the better built it is for RPM

[@boosted.]

@@paulskartslifan4206Absolutely over square for high RPM and under square Lower RPM torque. I guess what I’m asking you is with this short block if it had the support it needed ie head, cam, valve train, how fast could you spin it 7500? 9000? Just wondering because it looks like a freakin thumper.

[@paulskartslifan4206]

@@boosted. yeah, I mean RPM would be depicted by the cam and airflow but with a billet head like we would recommend and a cam set up for high RPMs like the PKRPM3 cam it will do every bit of 9k rpm

[@johnmatos6395]

Is this 212 based or 301 based ?

[@RainbowSheep_was_taken]

its a 212

[@paulskartslifan4206]

Small block GX 200 style clone Tilletson Block

[@t-bone1890]

Do you ever build or sell parts for a predator 670?

[@paulskartslifan4206]

@@t-bone1890 we can do all kinds of stuff to the heads of the 670 but we don’t stock or do bottom end stuff for those

[@t-bone1890]

@@paulskartslifan4206 sounds good, thanks for the reply. I’ll holler at you soon , after thanksgiving