Donny hat geschrieben:simmetuner hat geschrieben:Hello,
If you want more power you can put a 36mm PHF Dellorto and a 805 camshaft on your Silverstar. Or you look for the engines from RonWood
simmetuner
Hallo;
I have located a Rotax 805 (and also 670, 675, 850) camshaft. I know the lift and degree of duration for all of them (the 805 is 9.6 lift and 248 degree duration for example) but do not know the specifications of the original factory camshaft. Do any of you learned MZ gentlemen know the specifications of the factory cam? I wish I could post this in German and hope you understand what I am asking. Danke, Donny
Hi Donny,
one user here queried ROTAX about this a while ago and subsequently (Dec 8 2007, if i noted this down correctly
) posted the answer and list of camshafts he received. I'll just shortly repeat the information
for the 504 E used by MZ:
The 504E/27HP came with 660 camshaft (237660, 225°, listed for 348GS and 506 Regolarita):
- outlet opens 36,5° BBDC, closes 8,5° ATDC, stroke 5,82 (valve stroke 7,9)
- inlet opens 3,5° ATDC, closes 48,5° ABDC, stroke 5,82 (v.stroke 7,9)
(this are the timings for the 506 Regolarita, the timings for 348 GS are all shifted by 6°. The 504E
presumably resembles the 506, not the 348)
The 504E/34HP's camshaft was marked 660* and is identical to the 800 and its replacement 801
(237800/237801, 249°, listed for 506-560):
- outlet opens 55° BBDC, closes 14° ATDC, stroke 6,87 (v.stroke 9,3)
- inlet opens 12° BTDC, closes 57° ABDC, stroke 6,87 (v.stroke 9,3)
(the 800 and 801 must be identical at least in these values)
The 805 seems to be pretty similar to the 801, the 850 was not in the list. Beware of the 675/860/865
camshafts, the combustion chamber won't remain collision free with these!
kind regards
M(u)Z 500 RSX, Bj. '94