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914World.com _ 914World Garage _ Got my Sunpro Digital Engine Analyzer CP7676

Posted by: yarin May 25 2005, 08:03 PM

'72 914-4 Webers 40s, stock motor

I got my meter off ebay for $24, hooked it up right away and BAM. My dwell was set to 46 degrees after gaping it with a feeler gauge. So I nudged it a bit and BAM... 49 degrees. pretty damn good. RPM works like a charm as well. I'm thinking about setting up a temporary mount inside the car hardwired for voltage, rpm and dwell.

I'm taking this piece of crap Craftsman Engine Analyzer back to Sears, what a waste of 50 bucks for an analog meter.

Then I busted out the timing light with advance, held at 3k rpm and adjusted the distributor to line up with TDC. I briefly caught another mark, but the mark that i lined up with is immediately to the right of the large fin on the fan. Is this correct?

I'll take it for a spin tommorow and see how it runs. Sounds much better than before though. After that i will adjust the valves, one of the cylinders keeps backfiring through the intake. Hopefully its a valve clearance issue. If i'm still having problems then i'm going to order a set of those carb flow meters and learn to tune carbs.

This is all on my crappy engine. I want to get some experience on these Type IVs before i drop in my higher power motor.

Is my sequence of tuning correct? 1) Dwell 2) Timing Advance 3) Valves 4) Carbs

Posted by: TimT May 25 2005, 08:26 PM

valves first

Posted by: yarin May 26 2005, 10:19 AM

ummm.. WORD!

Posted by: mistro May 26 2005, 05:11 PM

Yarin, Is this the same beast?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=42291&item=4383968175&rd=1&ssPageName=WDVW

If so I'm bidding on one. Rgds, Michael

Posted by: yarin May 26 2005, 06:18 PM

Sorry.. this is the item i got:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4550252741

I'm sure the other one will work just fine though. Mine is new in box, works like a charm. RPM is nice to have, but its a really slow refresh rate. I expected that though.

good luck!

Posted by: MecGen May 26 2005, 07:06 PM

Hi
A backfire thru the carb is usually a "lean" condition.
try to hear what side is farting, start there, or your carbs might not be jetted right. Small backfires, I had also, got it 99% right by playing with jets.
Good luck with it
Later
Joe