What Carb for Poly Stroker
But looking at this
I can imagine a spread-bore of some kind on there, without too much work.
The reasons I like a spread-bore for this combo are;
it's already a 10.8 engine and
the small solid cam is gonna have an early closing intake,
which means those two together, are gonna cause the cylinder pressure to climb, maybe too high for pumpgas. I mean, the Wallace calculator is predicting pressures between 182 and 190 psi!
But IIRC, the chamber design of that engine has no quench, nor squish, so
That leads me to imagine that it may be detonation-prone at lower rpms. IDK, I've never had a poly.
Small Primaries may help to keep the Effective compression pressure below the detonation limit, with pumpgas. Then, just adjust the secondary throttle-timing to be a lil lazy, and it might survive.
If a spreadbore is impossible, then second choice is a vacuum/AVS-type, secondary.
Altho, if it was mine, I'd be trying very hard to make a 750DP work, cuz if I break it, I can fix it.
What I'm really saying is that besides the TQ, I'm no fan of vacuum-secondary carbs, and in particular, not a fan of the 1850; unless it's for cruising in overdrive................. they work ok for that, if you know how to doctor them.
No matter what you choose;
Happy HotRodding
I did not know that;
But looking at this
I can imagine a spread-bore of some kind on there, without too much work.
The reasons I like a spread-bore for this combo are;
it's already a 10.8 engine and
the small solid cam is gonna have an early closing intake,
which means those two together, are gonna cause the cylinder pressure to climb, maybe too high for pumpgas. I mean, the Wallace calculator is predicting pressures between 182 and 190 psi!
But IIRC, the chamber design of that engine has no quench, nor squish, so
That leads me to imagine that it may be detonation-prone at lower rpms. IDK, I've never had a poly.
Small Primaries may help to keep the Effective compression pressure below the detonation limit, with pumpgas. Then, just adjust the secondary throttle-timing to be a lil lazy, and it might survive.
If a spreadbore is impossible, then second choice is a vacuum/AVS-type, secondary.
Altho, if it was mine, I'd be trying very hard to make a 750DP work, cuz if I break it, I can fix it.
What I'm really saying is that besides the TQ, I'm no fan of vacuum-secondary carbs, and in particular, not a fan of the 1850; unless it's for cruising in overdrive................. they work ok for that, if you know how to doctor them.
No matter what you choose;
Happy HotRodding
