Alternator heat shield

[DWW]

Is there any point installing one on an S1 3.8 with an alternator conversion as they never were supplied from factory?

[mtnjag]

I put in the simple stainless shield that goes between the manifold and rear if the Alternator.
Note that the REAR of the alternator is the INTAKE and the front fan pulls air from the rear through the alternator and out the front. So the rear shield at least breaks the direct radiation.

If your talking about the larger nacelle type shield over the top I think that's more of a safety protection shield for the belt and pulley.

[DWW]

Thinking of this one:

https://i.ebayimg.com/images/g/K~QAAOSw ... s-l500.jpg

[mtnjag]

That's like the one I used.

[Series1 Stu]

I made one for my 3.8 using 0.7mm stainless steel sheet and rivetted some fibreglass thermal matting to the back.

It was more for preventing radiant heat transfer when stationary but allowing airflow when on the move. I remember thinking that the factory 4.2 item appeared pretty ineffectual for radiant heat.



Regards

[DWW]

Good idea.

[mtnjag]

Good idea. Ugly but likely effective. Functionality wins, may put it on the projects list.

[DWW]

Ordered from Martin Rubey.

[DWW]

Installed today looks like it means businessforgot to take a photo

[caveman]

Did you opt for S1;

Or S2;

Or both.

[DWW]

S2, a slightly tidier appearance....more pleasing to the eye.

[mtnjag]

The larger shield doesn't really do anything for heat as far as I can see. More of a "safety" shield I think. The simple stainless one shields the rear air intake of the Alternator from the exhaust manifold heat, somewhat anyway. The added shielding added by Series1 Stu does an even better job.

[caveman]

The larger shield doesn't really do anything for heat as far as I can see. More of a "safety" shield I think.

S2, a slightly tidier appearance....more pleasing to the eye.

S2 half the price too!

[Geoff Allam]

I recall that at one time there was a thread where it was suggested that the s1 shield was there to improve air flow through the alternator. Is that no longer considered correct?

[caveman]

Strangely, just read about it on JagLovers, not convinced tbh;
https://forums.jag-lovers.com/t/series- ... d/383259/3

[Series1 Stu]

Ugly but likely effective.

Non taken!

Actually, I agree it is rather ugly. You've shamed me into thinking about designing and making a new version.

Regards

[Geoff Allam]

Steve, that just shows how bad my memory is getting. I recalled the thread and the variety of theories but completely forgot that I had started the thread. Anyways, since then I have acquired an original series 1 shield and will install both it and the little series 2 one just for good measure.

[mtnjag]

Geoff, It never was correct. On these and most alternators air flow is back to front. The fan in front PULLs air from the rear of the alternator, through and out the front. Seems counter intuitive I know but that's the way they work. Common misconception.
That's why the shield between the exhaust manifold and the rear of the alternator makes sense and the top shield is a cosmetic or safety shield that leaves the rear completely exposed to the exhaust manifold heat. Might even make the alternator hotter when at a stop by enclosing it and not letting heat radiate off, don't know.