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Hesitation after a corner

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simps
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Re: Hesitation after a corner

Postby simps » 12 Sep 2020 18:25

Yes, SUs

It’s 3in1 type oil, I forget the actual brand

saabfast
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Re: Hesitation after a corner

Postby saabfast » 12 Sep 2020 22:12

SU dashpots should be filled with engine oil (normal 20/50). This is more viscous and slows/damps the movement of the piston. This is recommended in the manual.
Alan
Saab 9-5 2.3t Vector Auto Estate Stage 1
Saab 9-3 2.0 SE Turbo Convertible
'81 TR7 DHC
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Beans
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Re: Hesitation after a corner

Postby Beans » 13 Sep 2020 10:16

Interesting aftermarket dizzy cap.
Are there any manufacturer markings/numbers you could share?
Picture's resolution is to low to judge properly.
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1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

simps
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Re: Hesitation after a corner

Postby simps » 13 Sep 2020 10:45

No nothing that I can see, I have posted higher res pics but there are file size limits
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FI Spyder
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Re: Hesitation after a corner

Postby FI Spyder » 13 Sep 2020 14:19

Is that cap off center or what!
- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 2013 Volt - Yellow TCT

Beans
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Re: Hesitation after a corner

Postby Beans » 13 Sep 2020 17:09

FI Spyder wrote:Is that cap off center or what!

And could it be that the dizzy cap moves around a bit?
Image
1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

saabfast
TRiffic
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Location: Royal Tunbridge Wells

Re: Hesitation after a corner

Postby saabfast » 13 Sep 2020 18:13

Looks flat on the base with no rebate to hold it central on the rim of the dizzy?
Alan
Saab 9-5 2.3t Vector Auto Estate Stage 1
Saab 9-3 2.0 SE Turbo Convertible
'81 TR7 DHC
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dursleyman
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Re: Hesitation after a corner

Postby dursleyman » 14 Sep 2020 13:53

Most likely an Ambassador cap, they are often used by the Dolomite boys and are sold as an option to give a side entry plug-in type cap but they are higher than the usual Sprint cap. They have two screws to attach them normally but you can take the screws out and the usual spring clips will work. They often get supplied with a red rotor arm as part of the "conversion kit" for a Sprint.
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Last edited by dursleyman on 14 Sep 2020 14:17, edited 1 time in total.
Russ

1981 TR7 Sprint DHC & TR7 Sprint FHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

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simps
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Re: Hesitation after a corner

Postby simps » 14 Sep 2020 14:11

interesting!

There is an invoice in the copious amounts of paperwork for a second hand dizzy from Robsport, so I emailed them the pics - this is the response

Hi,

I looks like a Sprint distributor to me with Lumenition magnetronic system fitted, but with a different cap and leads from original (there are many things like this available on the internet, and many work well).

Kind regards
Simon


So the Ambassador cap theory sounds reasonable. I'll look for a replacement like for like and see what happens - or are they interchangeable?

Hasbeen
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Re: Hesitation after a corner

Postby Hasbeen » 15 Sep 2020 05:54

I had a Lumenition system on the 7, which took about 4 years to die.

I would get a slight hesitancy in acceleration from low revs for the first 4 or 5 kilometres from cold, after which it would clean up. Each time this appeared I would clean everything in the ignition & fuel systems, & the problem would disappear for 6 or 12 months, only to reappear.

It was never testable by the time I got to the auto electrician in town, 26 kilometres away. At it's last appearance it got bad enough to actually cut the engine for a second or so, long enough to drop the rev counter to near zero, pinpointing the problem.

I finally found a mobile sparky who came & tested it cold, declared it was the Lumenition module, supplied & fitted a new system. That was about 6 years ago. No further problem, & I think a little more power.

Hasbeen

dursleyman
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Re: Hesitation after a corner

Postby dursleyman » 17 Sep 2020 13:40

simps wrote:interesting!
I looks like a Sprint distributor to me with Lumenition magnetronic system fitted, but with a different cap and leads from original (there are many things like this available on the internet, and many work well).

Kind regards
Simon[/color]

So the Ambassador cap theory sounds reasonable. I'll look for a replacement like for like and see what happens - or are they interchangeable?


Have a look at the distributor body for the part number, it looks like a Sprint one which is a Lucas 44D4. If yes you can use a Sprint cap (like the smaller one in my pictures) but you will need new leads and the Sprint rotor arm to match. Also fits on a 45D distributor. Probably easiest to get a new Ambassador cap and rotor and start with that.

Like this.
https://www.ebay.co.uk/itm/Lucas-45D-di ... 0448703566
Russ

1981 TR7 Sprint DHC & TR7 Sprint FHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

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