Search found 78 matches

by MattsDad
Tue Aug 09, 2011 10:58 pm
Forum: Vespa Tech
Topic: Height adjustable rear shock
Replies: 2
Views: 2014

Re: Height adjustable rear shock

Fournales shocks, u can get them from SIP.
by MattsDad
Tue Jul 26, 2011 8:10 pm
Forum: Vespa Dyno Graphs
Topic: VESPA DYNO GRAPH POSTING AREA
Replies: 28
Views: 96968

Re: VESPA DYNO GRAPH POSTING AREA

My PX small block - Quattrini M1X, Cockspeed Tuning crank, MMW V3 Tass, 38 Mikuni, no welding - 34.09.

Image
by MattsDad
Sun May 29, 2011 12:11 am
Forum: Vespa Tech
Topic: Small frame tuning direction
Replies: 8
Views: 4147

Re: Small frame tuning direction

With respect to this forum and if you've not done so already, you're better off looking at the SF site, there is a wealth of info on all the barrels and tuning options. :bald:
by MattsDad
Wed Apr 06, 2011 12:34 am
Forum: Vespa Tech
Topic: Malossi reed valve
Replies: 4
Views: 1602

Re: Malossi reed valve

Inlet area b4 petals shouldn't be more than 15% of the carb bore, maybe u can dremmel the stuffer a bit if using a bigger carb.
by MattsDad
Sat Mar 05, 2011 1:19 am
Forum: Vespa Tech
Topic: malossi 166 gearing
Replies: 14
Views: 8027

Re: malossi 166 gearing

No
by MattsDad
Sun Jan 09, 2011 11:07 pm
Forum: Vespa Tech
Topic: air fuel ratio on the dyno
Replies: 76
Views: 21485

Re: air fuel ratio on the dyno

That's a really good point; 4% Lammy mix would give a 0.60 ratio difference to the lean side.
by MattsDad
Tue Dec 21, 2010 12:52 am
Forum: Vespa Tech
Topic: air fuel ratio on the dyno
Replies: 76
Views: 21485

Re: air fuel ratio on the dyno

Thanks Al, thats the post that has made this worthwhile for me and relieved a little stress over this. My take has always been that you cannot argue with the science of this in terms of the accuracy, the scavenging nature won't allow it. The Lamda sensor I bought was for a car in the belief AF is AF...
by MattsDad
Sun Dec 19, 2010 8:11 pm
Forum: Vespa Tech
Topic: air fuel ratio on the dyno
Replies: 76
Views: 21485

Re: air fuel ratio on the dyno

Yes goodwill etc because I'm not wanting to fall out with anybody. The MJP demo version you provided the link for does indeed show a box to tick for a 2 stroke engine. It is however in the bmep section of the paramaters and of course the 2 stroke figure is half the psi of a 4 stroke so this tick box...
by MattsDad
Sun Dec 19, 2010 1:21 pm
Forum: Vespa Tech
Topic: air fuel ratio on the dyno
Replies: 76
Views: 21485

Re: air fuel ratio on the dyno

I had hoped this would fizzle out but I think that you're probably more naive than arrogant in dismissing Prof Blair so readily! His specialty is 2 strokes, the book is about 2 stroke engine design; he makes reference to four stroke in one sentence about oxygen concentration but conveniently you lea...
by MattsDad
Tue Dec 14, 2010 4:41 am
Forum: Vespa Tech
Topic: air fuel ratio on the dyno
Replies: 76
Views: 21485

Re: air fuel ratio on the dyno

PM on way to you JIMS.