Zcat7
Well-known member
- Joined
- Apr 12, 2010
- Messages
- 670
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- Location
- Oxfordshire
- Year of Your Van(s)
- 1972
- Van Type
- Crossover
I've had a few false starts since building this engine but I think I'm nearly there... Now I just need some advice to get rid of the last few niggles
http://forum.earlybay.com/viewtopic.php?f=2&t=53981
I have dual Kadron/Solex 40s, which were perfect on my old 1641. I got a jetting and venturi pack from Kaddieshack (apparently the experts in Kadrons) which is supposed to match the new config - 1776 with standard heads and Engle 100 cam and SVDA with the vacuum from the left carb (they say its a very common setup).
The problems I have now are some stuttering just off throttle/very light throttle which seems to get worse with engine temp (makes cruising at 30 very irritating). Even on the drive if I rev to about 2000rpm the engine kind of makes a "fuffling" sound, which goes when you throttle up or down. Also I previously had to adjust the accelerator pumps to max to get it to rev freely without hesitating and thought I was done with that. I then took it for its longest high-speed run since the rebuild the other day. The temperature gauge settled on 220 when cruising at 3500rpm, which I thought might be a bit hot. Previously, on country lanes on a hot day, it had settled on 180. But now, as it it gets hot, it starts to falter a bit on hard acceleration, which twinned with the stuttering makes it all a bit annoying. I backed off the timing a bit as it was over 34 degrees max advance. Now its 30 deg at 3500 revs, vac connected. This seemed to improve things but it hesitates a bit again when revving now...
The engine feels and sounds so good in all other respects (starts on the button, ticks over nice etc) and does accelerate strongly through most parts of the rev range so I'm convinced that its just fuel and/or timing. I just need to smooth these niggles out but am not sure where to go now.
So -
Could the jetting be wrong? I have adjusted mixture several times and the acc pumps are maxed
Is the timing wrong?
Could the vac advance curve be wrong for a 1776 with that cam?
Would I be best putting the old 009 dizzy back?
Could the plugs be too cold/hot? (I'm using NGK BP5ES)
http://forum.earlybay.com/viewtopic.php?f=2&t=53981
I have dual Kadron/Solex 40s, which were perfect on my old 1641. I got a jetting and venturi pack from Kaddieshack (apparently the experts in Kadrons) which is supposed to match the new config - 1776 with standard heads and Engle 100 cam and SVDA with the vacuum from the left carb (they say its a very common setup).
The problems I have now are some stuttering just off throttle/very light throttle which seems to get worse with engine temp (makes cruising at 30 very irritating). Even on the drive if I rev to about 2000rpm the engine kind of makes a "fuffling" sound, which goes when you throttle up or down. Also I previously had to adjust the accelerator pumps to max to get it to rev freely without hesitating and thought I was done with that. I then took it for its longest high-speed run since the rebuild the other day. The temperature gauge settled on 220 when cruising at 3500rpm, which I thought might be a bit hot. Previously, on country lanes on a hot day, it had settled on 180. But now, as it it gets hot, it starts to falter a bit on hard acceleration, which twinned with the stuttering makes it all a bit annoying. I backed off the timing a bit as it was over 34 degrees max advance. Now its 30 deg at 3500 revs, vac connected. This seemed to improve things but it hesitates a bit again when revving now...
The engine feels and sounds so good in all other respects (starts on the button, ticks over nice etc) and does accelerate strongly through most parts of the rev range so I'm convinced that its just fuel and/or timing. I just need to smooth these niggles out but am not sure where to go now.
So -
Could the jetting be wrong? I have adjusted mixture several times and the acc pumps are maxed
Is the timing wrong?
Could the vac advance curve be wrong for a 1776 with that cam?
Would I be best putting the old 009 dizzy back?
Could the plugs be too cold/hot? (I'm using NGK BP5ES)