2332 cc single carburettor will it work

[modnrod]

If you don't mind me asking, what diameter venturi are you using with the 37 or 39 throttle plates?
I have a 36.5PICT with a 30mm venturi, so was curious about the balance.

PS: the stack looks great !
 

[JPS aircooled]

Hi Modnrod,

The venturi on the 37 was 31mm on the 39 no venturi the inside of the carb body was reshaped and is "the venturi" so its approx. 34mm
If you interessed Guido Wensing from Germany made both of them.

Oldtimer Wensing 39 PCIT-3 in Google and you have it.

The Stack is a reshaped 51mm from Jenvey

Cheers Pit

[modnrod]

About the same ratio then.
thanks Pit.

[andy198712]

i ran a 34 pict 3 with no venturi, so 34mm. on my 2110 with an 86b and 9.3 to one. that would ping at WOT with AFRs in the 12's, i had to retard it to about 24/22 degrees if i recalls to make it okay but would still ping on longer drives

[JPS aircooled]

Hi Andy,

86b with a single 34-37-39 PICT-3 doesn`t work
I have build several single carb engine and that cam is to much

with AFR in 12`s and Ping?

I ran 12.8-13.2  at WOT no ping, I have had a ping but at low rpms because of the to small accerlation pump.

But you can compensate this with the 1-2-3- Tune

[Torben Alstrup]

i ran a 34 pict 3 with no venturi, so 34mm. on my 2110 with an 86b and 9.3 to one. that would ping at WOT with AFRs in the 12's, i had to retard it to about 24/22 degrees if i recalls to make it okay but would still ping on longer drives

You most likely tried to run on 87 octane 

[Torben Alstrup]

But you can compensate this with the 1-2-3- Tune

Does the 123 tune also "compensate" for idle and dwell as the older ones do?

[andy198712]

i ran a 34 pict 3 with no venturi, so 34mm. on my 2110 with an 86b and 9.3 to one. that would ping at WOT with AFRs in the 12's, i had to retard it to about 24/22 degrees if i recalls to make it okay but would still ping on longer drives

You most likely tried to run on 87 octane 

yeah i didn't understand it, premium fuel but still had to be careful. think i ended up on about 25 degree WOT (via megasquirt)

now i'm fuel injected TBI's its a total non issue,

it ran and i did some long trips on it, but it wasn't optimal

[Torben Alstrup]

i ran a 34 pict 3 with no venturi, so 34mm. on my 2110 with an 86b and 9.3 to one. that would ping at WOT with AFRs in the 12's, i had to retard it to about 24/22 degrees if i recalls to make it okay but would still ping on longer drives

You most likely tried to run on 87 octane 

yeah i didn't understand it, premium fuel but still had to be careful. think i ended up on about 25 degree WOT (via megasquirt)

now i'm fuel injected TBI's its a total non issue,

Just for shiats & giggles I ran a combo like that through the Analyzer. Apart from knowing that that was too much cam for the combo I wanted to see where it went wrong. The mix quality seems to be relatively poor and the overscavenging is very bad resulting in a lean condition. So that´s why you had problems with a stock intake.
It makes total sense, since I have had to reduce the exhaust efficiency before on engines like that.

it ran and i did some long trips on it, but it wasn't optimal

[andy198712]

Cool

[JPS aircooled]

@Torben

with the 1-2-3 tune I did my own ignition curve.

You can set the Ignition Point on the rpm chart where you want, on my engine was it only critical when I made a WOT pull from 1500rpm up
In the effect of the Little volume in the acceleration pump it only spray in once and than it get lean between approx. 2500-3500 rpm
This was compansate with a ignition curve works perfect

BR
Pit

[air_head]

Bit of a thread jack, but I have a 1776 with an Engle 110 cam, ~9.0:1 comp, and a Solex 30PIC (the old school manual choke like a 28pic). Do you guys think this could work or should I try bumping up to a 34pict or single 36drla?

[Zach Gomulka]

Bit of a thread jack, but I have a 1776 with an Engle 110 cam, ~9.0:1 comp, and a Solex 30PIC (the old school manual choke like a 28pic). Do you guys think this could work or should I try bumping up to a 34pict or single 36drla?

A stock carb needs a VERY mild cam to work well, the 110 is too much. Dual 36's would be best, but not in tune with this thread

[busbusbus]

who sells the large throttle plates?