Alpines List Archive

This read-only message was archived from a public mail list.
Mail From: "Raser, Jason" <(email redacted)>

You may recall I have a Series 2 that doesn't seem to run right. I think
I'm getting close to a solution.

I think I have eliminated all other possibile problems and everything points
to my Zenith Carbs. Scott was kind enough to send me the article "To carb
and Alpine."

Before I go ahead and rejet these carbs (they are NOS, so I've done all I
can to avoid opening them) I wonder if anyone has the experience I've had or
if you could direct me to the most knowlegeable person about jets for an
Alpine.

Turns out the carbs I have are:

C1688F
36WIP-2
1046674

and

C1688R
36WIP-2
1046874

The carbs I took off the car after I bought it were:

C3744F
36WIP-3
1800118

and

C1744R
36WIP-3
1800119

>From the article Scott sent me I see that the differences are:

Carb & Car Pump discharge Nozzle Idle Tube
36WIP-2 (S2) 50 50
36WIP-3 (S2) 70 45

New parts (or rebuilt):
Carbs
Generator
Distributor (45D from Moss Motors)
Mechanical fuel pump (from Sunbeam Specialties) (I've tried an electric pump
too)
New coil connected to a ballast resistor (a mechanic put this on)
Clean fuel tank

Engine compression:
1 120 psi
2 121 psi
3 120 psi
4 125 psi

I put a fuel regulator after the fuel pump to ensure that I've got the right
fuel pressure. I adjusted the carbs to run a bit rich and I can drive the
car. Runs fine on the flat spots but struggles very hard up the hills.
Have to keep it at 3,000-4,000 rpm.

I made sure my polarity on my coil is correct with the spark jumping from
the plug toward the plug wire. It jumps a good 1/4 inch or more.

I pulled the plugs and each of them are fine black powdery, naturally
because it's running too rich.

If I simply change the pump discharge nozzle and idle tube, could this
correct my problem by allowing me to run the carbs lean.

Any ideas would be appreciated.

Jason Raser

This read-only message was archived from a public mail list.
Mail From: Jarrid Gross <(email redacted)>

Jason,

You didnt mention what the main jets are/were.
These, and the choke "venturi" side are the things
that effect the running/power mixture not the pump
discharge nozzle, and idle tube/ jet.
The chokes are marked with a number, but could
possibly be measured in the carb. The chokes run
from 27mm to 30mm for the special tuning option
offered by rootes.

Also, some carbs are jeted for paper ellement filter,
and some are jetted for bird catchers, running paper
ellement filters with carbs setup for the bird cather
will tend to run rather rich due to the restricivity
of the filters.

In the sunbeam alpine I-IV, there is a table in the zenith
WIA/WIP section that describes the jets, air bleeds and
chokes for all zenith applications.

Hope this helps,

Jarrid Gross

-----Original Message-----
From: (email redacted)
[mailtoemail redacted)]On Behalf Of Raser, Jason
Sent: Tuesday, October 02, 2001 6:32 AM
To: (email redacted)
Subject: Zenith Carbs - Jetting


You may recall I have a Series 2 that doesn't seem to run right. I think
I'm getting close to a solution.

I think I have eliminated all other possibile problems and everything points
to my Zenith Carbs. Scott was kind enough to send me the article "To carb
and Alpine."

Before I go ahead and rejet these carbs (they are NOS, so I've done all I
can to avoid opening them) I wonder if anyone has the experience I've had or
if you could direct me to the most knowlegeable person about jets for an
Alpine.

Turns out the carbs I have are:

C1688F
36WIP-2
1046674

and

C1688R
36WIP-2
1046874

The carbs I took off the car after I bought it were:

C3744F
36WIP-3
1800118

and

C1744R
36WIP-3
1800119

>From the article Scott sent me I see that the differences are:

Carb & Car Pump discharge Nozzle Idle Tube
36WIP-2 (S2) 50 50
36WIP-3 (S2) 70 45

New parts (or rebuilt):
Carbs
Generator
Distributor (45D from Moss Motors)
Mechanical fuel pump (from Sunbeam Specialties) (I've tried an electric pump
too)
New coil connected to a ballast resistor (a mechanic put this on)
Clean fuel tank

Engine compression:
1 120 psi
2 121 psi
3 120 psi
4 125 psi

I put a fuel regulator after the fuel pump to ensure that I've got the right
fuel pressure. I adjusted the carbs to run a bit rich and I can drive the
car. Runs fine on the flat spots but struggles very hard up the hills.
Have to keep it at 3,000-4,000 rpm.

I made sure my polarity on my coil is correct with the spark jumping from
the plug toward the plug wire. It jumps a good 1/4 inch or more.

I pulled the plugs and each of them are fine black powdery, naturally
because it's running too rich.

If I simply change the pump discharge nozzle and idle tube, could this
correct my problem by allowing me to run the carbs lean.

Any ideas would be appreciated.

Jason Raser

This read-only message was archived from a public mail list.
Mail From: "Louis & Laila" <(email redacted)>

You might also want to check the compression, because, depending on your
engine, that compression seems mighty low. Lou
----- Original Message -----
From: "Jarrid Gross" <(email redacted)>
To: "Raser, Jason" <(email redacted)>; <(email redacted)>
Sent: Tuesday, October 02, 2001 8:39 AM
Subject: RE: Zenith Carbs - Jetting


> Jason,
>
> You didnt mention what the main jets are/were.
> These, and the choke "venturi" side are the things
> that effect the running/power mixture not the pump
> discharge nozzle, and idle tube/ jet.
> The chokes are marked with a number, but could
> possibly be measured in the carb. The chokes run
> from 27mm to 30mm for the special tuning option
> offered by rootes.
>
> Also, some carbs are jeted for paper ellement filter,
> and some are jetted for bird catchers, running paper
> ellement filters with carbs setup for the bird cather
> will tend to run rather rich due to the restricivity
> of the filters.
>
> In the sunbeam alpine I-IV, there is a table in the zenith
> WIA/WIP section that describes the jets, air bleeds and
> chokes for all zenith applications.
>
> Hope this helps,
>
> Jarrid Gross
>
> -----Original Message-----
> From: (email redacted)
> [mailtoemail redacted)]On Behalf Of Raser, Jason
> Sent: Tuesday, October 02, 2001 6:32 AM
> To: (email redacted)
> Subject: Zenith Carbs - Jetting
>
>
> You may recall I have a Series 2 that doesn't seem to run right. I think
> I'm getting close to a solution.
>
> I think I have eliminated all other possibile problems and everything
points
> to my Zenith Carbs. Scott was kind enough to send me the article "To carb
> and Alpine."
>
> Before I go ahead and rejet these carbs (they are NOS, so I've done all I
> can to avoid opening them) I wonder if anyone has the experience I've had
or
> if you could direct me to the most knowlegeable person about jets for an
> Alpine.
>
> Turns out the carbs I have are:
>
> C1688F
> 36WIP-2
> 1046674
>
> and
>
> C1688R
> 36WIP-2
> 1046874
>
> The carbs I took off the car after I bought it were:
>
> C3744F
> 36WIP-3
> 1800118
>
> and
>
> C1744R
> 36WIP-3
> 1800119
>
> From the article Scott sent me I see that the differences are:
>
> Carb & Car Pump discharge Nozzle Idle Tube
> 36WIP-2 (S2) 50 50
> 36WIP-3 (S2) 70 45
>
> New parts (or rebuilt):
> Carbs
> Generator
> Distributor (45D from Moss Motors)
> Mechanical fuel pump (from Sunbeam Specialties) (I've tried an electric
pump
> too)
> New coil connected to a ballast resistor (a mechanic put this on)
> Clean fuel tank
>
> Engine compression:
> 1 120 psi
> 2 121 psi
> 3 120 psi
> 4 125 psi
>
> I put a fuel regulator after the fuel pump to ensure that I've got the
right
> fuel pressure. I adjusted the carbs to run a bit rich and I can drive the
> car. Runs fine on the flat spots but struggles very hard up the hills.
> Have to keep it at 3,000-4,000 rpm.
>
> I made sure my polarity on my coil is correct with the spark jumping from
> the plug toward the plug wire. It jumps a good 1/4 inch or more.
>
> I pulled the plugs and each of them are fine black powdery, naturally
> because it's running too rich.
>
> If I simply change the pump discharge nozzle and idle tube, could this
> correct my problem by allowing me to run the carbs lean.
>
> Any ideas would be appreciated.
>
> Jason Raser

This read-only message was archived from a public mail list.
Mail From: Ron Tebo <(email redacted)>

Jason:

Your compression readings are quite low. Are you sure that you took
these readings with the throttle and choke wide open?

Ron Tebo

"Raser, Jason" wrote:
>
> You may recall I have a Series 2 that doesn't seem to run right. I think
> I'm getting close to a solution.
>
> I think I have eliminated all other possibile problems and everything points
> to my Zenith Carbs. Scott was kind enough to send me the article "To carb
> and Alpine."
>
> Before I go ahead and rejet these carbs (they are NOS, so I've done all I
> can to avoid opening them) I wonder if anyone has the experience I've had or
> if you could direct me to the most knowlegeable person about jets for an
> Alpine.
>
> Turns out the carbs I have are:
>
> C1688F
> 36WIP-2
> 1046674
>
> and
>
> C1688R
> 36WIP-2
> 1046874
>
> The carbs I took off the car after I bought it were:
>
> C3744F
> 36WIP-3
> 1800118
>
> and
>
> C1744R
> 36WIP-3
> 1800119
>
> >From the article Scott sent me I see that the differences are:
>
> Carb & Car Pump discharge Nozzle Idle Tube
> 36WIP-2 (S2) 50 50
> 36WIP-3 (S2) 70 45
>
> New parts (or rebuilt):
> Carbs
> Generator
> Distributor (45D from Moss Motors)
> Mechanical fuel pump (from Sunbeam Specialties) (I've tried an electric pump
> too)
> New coil connected to a ballast resistor (a mechanic put this on)
> Clean fuel tank
>
> Engine compression:
> 1 120 psi
> 2 121 psi
> 3 120 psi
> 4 125 psi
>
> I put a fuel regulator after the fuel pump to ensure that I've got the right
> fuel pressure. I adjusted the carbs to run a bit rich and I can drive the
> car. Runs fine on the flat spots but struggles very hard up the hills.
> Have to keep it at 3,000-4,000 rpm.
>
> I made sure my polarity on my coil is correct with the spark jumping from
> the plug toward the plug wire. It jumps a good 1/4 inch or more.
>
> I pulled the plugs and each of them are fine black powdery, naturally
> because it's running too rich.
>
> If I simply change the pump discharge nozzle and idle tube, could this
> correct my problem by allowing me to run the carbs lean.
>
> Any ideas would be appreciated.
>
> Jason Raser