Hi folks,
A while back I wrote about my 2007cc engine. I thought the engine had a low CR of 6.9:1. So I checked my deck height and cc'd the heads and what? My CR appears to be 8.5:1. I am using an excel spreadsheet someone posted a while back.
Here is what the numbers look like.
Heads: 50cc's Deck Height: .1" Bore: 90.5mm Stroke: 78mm
So if this is in fact the case. (My numbers may be wrong, I will double check), then why am I running rich and my 44IDF's not responding to adjustment. Hmmm. Must be jetting.
I pulled out the Emulsion tubes and found the following.
Idle Jets: 55 Emulsion: F11 Main A/C: 200 Main: 135
I looked up the suggested settings in the Weber book and they suggest:
Idle Jets: 55 Emulsion: F11 Main A/C: 225 Main: 175
So would my original jet settings cause carbon buildup in the head, no response on the fuel mixture etc?
I realize the adjusting screws are for the mixture that is dictated by the jets, and is pretty much a volume thing more than a mixture thing.
Oh yeah, my heads are ported and polished 042's. Exhaust is merged 1 5/8's with stinger. Intakes are berg matched to carb, but not to the head. 1.4:1 ratio rockers with FK7 Cam.
I am hoping that this is just a jet issue. I was thinking of starting with
220 A/C's and moving to 225 A/C's if still to rich.Any thoughts or glaring errors would be humbly accepted.
Matt
Thanks to all who have written in the past. I've been out of this for a while, so I'm a bit rusty as it were.