Originally Posted by
Jerseyboy
I own one of these beasts.
In a buggy its excellent, very linear powerband with a wicked upper midrange and topend.
I used it in my truggy and it lacks the bottom end for a truggy. If you use it with a werks clutch and adjust for later engagement then it will work.
This is apparently JP's most powerfull engine. The internals are top notch. The casing inside has been worked, the crank is a work of art. The sleeve porting is beautifull.
I changed the sleeve with a P5 sleeve and must agree with razzor that the 5 port is a much better option. You can use any P5 sleeve and it will work in this engine. At least keep the option in mind. With the 5 port sleeve this engine uses more of its power. With the 8 port you get to 3/4 of the straight and it wants to only start delivering.
I use the novarossi 821 in my 5T truggy. But i do timing changes that really brings the bottom end to life, but yet still has a nice top end pull to it! I run 1mm springs and light aluminum shoes and a 53 pipe and it works great. On the track we run on it has a long straight so we all go up to 14 tooth bells and the 821 has MY modded 821s have NO issues pulling it right out of the corners!
I actually really like these mills alot. Very smooth power delivery, but if u grab a hand full itll get u over a triple NP. I thik its a highly underated engine IMO. But then again mine are all modified to different timing specs...