MonteMorris wrote:
> Thanks Barney,
> Duh, after you pointed it out I see that it mentions the socket head cap
> screws (I suppose these are not really screws if they screw into the
> bolt-threaded holes on the carbs?) on the website address you posted below).
> A few more questions:-).
> 1. Where can I find the vacuum tap point for the dizzy number that I have? I
> found the dizzy timing on Paul's site.
Not sure. But you said it was a 45D, which should be off the intake. But
then again, I'm just guessing.
> 2. I have the same aftermarket air cleaners that are shown on the address
> that you pasted in below. They came with a metal backing plate to mount to
> the carbs. From the picture, I'm assuming that this plate is not used if I
> bore out and mount the old air cleaner back plates as shown? Do I just
> stretch the new oval air filters around the old back plate?
No, you'll need the back plates. The little wire holders clip over the
plates. The pieces you are using are the inner alloy backplate adapter
(Moss part 372-380).
You put the backplate in, then the adapter. The wire mesh, foam and
plastic holder go over the adapter and inside the lip of the backplate.
The wire holder goes over that and clips around the backplate.
If you don't put the spacers in the engine mount, then you'll need to
dent the wire mesh of the foam for the back carb to get around the brake
booster.
Paul.
> Thanks again,
> Monte
>
> ----- Original Message -----
> From: "Barney Gaylord" <barneymg@mgaguru.com>
> To: "MonteMorris" <mmorris@nemr.net>; "MG list" <mgs@autox.team.net>
> Sent: Wednesday, October 15, 2003 12:04 AM
> Subject: Re: ZS to HIF
>
>
>
>>At 10:58 PM 10/14/03 -0500, MonteMorris wrote:
>>
>>>....
>>>(HIF's and all related hardware off a 74 parts car. They are going onto
>
> a
>
>>>desmogged 79B)
>>>
>>>1. the 74's instruction plate by the radiator says: time to 11 degrees
>>>BTDC at 1500 RPM and gap plugs at .025. The 79 is timed about 18-20
>>>degrees BTDC, .035 plug gaps, and has a points dizzy in it. What settings
>>>should I try now and should I use the dizzy out of the parts car, or keep
>>>the one that's in the 79 (45D, I believe).
>>
>>Early cars took distributor vacuum from the rear carb venturi, so vacuum
>>came up suddenly when throttle was opened. Later cars took distributor
>>vacuum from the intake manifold, where vacuum is high at idle and drops
>>suddenly when throttle is opened. The distributor model has to match the
>>vacuum tap point. If you get it wrong you end up with a nasty case of
>>vacuum retard which really screws up spark timing and engine torque.
>>
>>When you get the vacuum tap point and distributor matched, then use the
>>timing spec that goes with the model year for the distributor.
>>
>>
>>>2. I rerouted the heater hose (with metal tube) downward between the
>>>manifold and the heat shield. Will this cause any problems, or should I
>>>put it back up by the valve cover?
>>
>>Metal pipe along side of valve cover and dropping in front of exhaust
>>manifold to commect to "T" at water pump inlet is not a problem, as long
>
> as
>
>>the water pipe is not touching the exhaust manifold. That's how it was
>>done on MGA and early MGB, at least through 1967 models, maybe through
>>1969. Moved up top by 1970, presumably to clear space for some emissions
>
> bits.
>
>>>3. On the Chicagoland MG site, I read to use the old alloy back plates
>>>off the 74's air cleaners to put inside the oval foam air cleaners
>>>(#223-220, pp. 7) so you can use the Unisyn easily without removing the
>>>air cleaners.
>>
>>Actually the alloy plates are used to improve air flow, similar to stub
>>pipes. The bit about using the Uniflow was to counterbore the bolt holes
>>in the alloy plates to make the screw heads flush.
>>
>>
>>>I can see you must bore out the mounting holes on the back plate so the
>>>bolt heads will be flush, but what type of mounting bolt (head) would you
>
> use?
>
>>Socket head cap screws. That info is smack in the middle of the page
>
> here:
>
>>http://chicagolandmgclub.com/photos/carbswap_zs2su/page2.html
>>right below the picture of the modified parts.
>>
>>Barney Gaylord
>>1958 MGA with an attitude (and a quick camera)
>>http://MGAguru.com
--
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