Don't laugh as I'm a bit puzzled! Where is the #1 firing position on a type 1 fitted with a 1641? This link says it's at the 11 o'clock position whereas a type 4 is at the 5 o'clock position, as you look through from the rear of the vehicle. As I look through from the back, at the moment #1 is next to the fuel pump. http://www.hot-spark.eu/docs/Installing-SVDA-009.pdf We have been working on fitting the 34 Icts, jetted them up, fitted a pressure regulator tweaked the idle, air flow and other screws as per the Weber book..will it run, no not smoothly. The engine pops and backfires, we know the manifolds are nice and tight, we have checked, the filters are not blocked and fuel is flowing. I don't know the make of the dizzy, it's the one that comes with the Remtec 1641 SSP motors
That bit I can get my head round, we have got tdc on #1 & we know the position of the plug lead in relation to this, they are all connected in the correct firing order. It's that link saying 11 o'clock position that's throwing me or doesn't it matter so long as it's all in sync?
Doesn't matter, as long as everything's physically convenient. You could tweak it by moving the plug leads round on cap.
it does appear to be in the correct locations but we're gonna start from scratch tomorrow to satisfy ourselves. We have ditched the Petronix & going back to points, just to satisfy us that its not acting up. We also have a spare coil we're going to try!
Is your timing correct? When I put a Pertronix on years ago, I managed to cock it up completely (brain wasn't working). Pretty deafening backfires were the result!
We have timed it (non running) to ~7' below tdc then when we have sat it at 1000 rpm and it appears to be close by this..running it at 3500 rpm & its between 28 to 30' below tdc My Dad has been doing the timing whilst Ive been up front
Sure is - threw me for a while . This may be what 11 o`clock position is about . 009 is same position as standard dizzy if i remember , about 4 o`clock -ish ?? Back to basics is the way forward ....
Look to ditch the 009 later as they can be cheap and get a vacuum one. The engine will run cooler and smoother when accelerating. Make sure the little copper tubes on the left lower sides of the ICTs are blocked off for now. When going to vacuum dizzy keep right plugged and use left one for the pipe.
Are you sure the ICTs have been jetted correctly? There have been other threads on her that discuss this.
Thanks for the reply Skutterbob, just to confirm, we do have the vacuum connectors blocked off, both carbs. The jets we have gone for are 175 needle jets 55 idle jets 140 mains 170 air correctors F6 emulsion tubes Three of the above are what came with the carbs but we replaced with brand new anyway, we swapped 150 mains for 140's and another pair of jets, which I cant remember as they are with Gusbus (it may have been the idle jets) had been opened out significantly. We do have Peter Burgess about five miles away who can RR tune them for us, which we do plan to do, when we can get over - we don't have MOT yet, hence the need to get it sorted prior to this If we get some luck later, Ill update on what we did!
Check the leads from the dissy go 1234 on the cylinders. The 1 and 2 leads cross over between dissy and plugs, 3 and 4 do not. Blew an EMPI twin rustpack up with 1 and 2 swapped over.
More twiddling done tonight & got not very further forward. Put a new coil on replaced Petronix with points, gapped them correctly and put dizzy back in the engine checked for tdc on #1 and ensured plug leads are connected correctly both ends checked fuel flow to pump and pump > carbs checked inlet manifolds are fitted correctly - they appear to be valve clearances are spot on timing set statically to 7'btdc engine still pops, bangs and backfires, idling is a little better but not smooth, timing checked and set again dynamically wtf is going wrong, the backfire comes up the inlet manifold & is visible down the balancer pipe. Are we missing something out?
