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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   Am I a whimp/wimp? Part 2; 6000 rpm and it broke (http://forums.pelicanparts.com/porsche-911-technical-forum/1067765-am-i-whimp-wimp-part-2-6000-rpm-broke.html)

group911@aol.co 08-09-2020 07:03 AM
$385??? That's insane.

ClickClickBoom 08-09-2020 08:29 AM
Nice when it works out! Double check your actual voltage at the battery terminals 13.9 to 14.2 is my range with the beast Nippondenso I installed.

pmax 08-09-2020 09:21 AM
Quote:
Originally Posted by group911@aol.co (Post 10978950)
$385??? That's insane.
That's including NY tax :)

OP,
Nice voltmeter there. Congrats on the DIY.

Funracer 08-09-2020 12:13 PM
Quote:
Originally Posted by pmax (Post 10979081)
That's including NY tax :)

OP,
Nice voltmeter there. Congrats on the DIY.
Agreed. Where did you get that?

LIRS6 08-10-2020 04:26 AM
Quote:
Originally Posted by Funracer (Post 10979269)
Agreed. Where did you get that?
Palo Alto Speedometer

Had the conversion done about a year ago, very glad I did it. The cost was about $750. Not cheap I know, but I love the look and function. Hartmut Mees at PA was great to deal with.

Jason

Flojo 08-10-2020 05:15 AM
Quote:
Originally Posted by LIRS6
As a footnote, I replaced the 10 x 725 belt with a 10 x 710 belt; 3 shims inside/3 shims outside and it was good to go.

Jason
hows that possible?!

GH85Carrera 08-10-2020 05:29 AM
You will learn to love the voltmeter on the tach. After many years of having mine I find myself checking voltage as often as oil pressure and oil temp. It is comforting to KNOW that the alternator is charging at the proper voltage. I had my internal voltage regulator give up the ghost, and it nearly cooked my battery back before I had the volt meter.

LIRS6 08-10-2020 06:54 AM
Quote:
Originally Posted by Flojo (Post 10979859)
hows that possible?!
Walt in post #33 notes 710 as well. The 725 that was previously on my car was waaaay too long (zero shims inside/7 outside, as configured by engine re-builder).

Question - how do you judge correct tension of the fan belt? Deflection should be about 1/2 inch at mid-point, right? ... but how much pressure are you using to test it? I don't want a too-tight belt, given my experience with alt bearing failure.

Jason

Starless 08-10-2020 07:31 AM
OK, now for that 6200 RPM blast part 2.

walt 08-10-2020 11:51 AM
Just apply moderate finger pressure to the center of the belt, deflection should be 1/4" to 1/2". The factory probably had a spec for it but I have never seen it.

LIRS6 08-10-2020 12:06 PM
Quote:
Originally Posted by walt (Post 10980363)
Just apply moderate finger pressure to the center of the belt, deflection should be 1/4" to 1/2". The factory probably had a spec for it but I have never seen it.
Thank you Walt

Jason

pmax 08-10-2020 12:13 PM
The way I look at it is to tighten it just enough so it doesn't squeal.

Bill Douglas 08-10-2020 12:18 PM
Quote:
Originally Posted by LIRS6 (Post 10979959)
but how much pressure are you using to test it? I don't want a too-tight belt, given my experience with alt bearing failure.

Jason
Mine is possibly a little more loose than others would have it - intentionally. Another shim and it would be tighter than I would want it. So I sprayed some stuff called belt dressing on it. It stops belts slipping and squeaking. I had it already for a steering pump belt on a Corolla, so I thought I'd use it on the SC. Works well.

GH85Carrera 08-10-2020 01:03 PM
I will say it again, just get the Porsche branded fan belt. It is the right size, and has the right angle to the sides of the belt. Yea, it is expensive, but it works like it is supposed to without moving shims around.

I went through a couple of aftermarket belts and could not get them to fit right. The Porsceh belt is perfect fit. Almost like it was designed for the car! ;)

Funracer 08-13-2020 07:56 AM
Quote:
Originally Posted by LIRS6 (Post 10979830)
$750.
:(

LIRS6 08-13-2020 09:09 AM
Quote:
Originally Posted by Funracer (Post 10984066)
:(
My choice, I'm glad i did it. Where I feel I got screwed was the cost for re-build of alt.

Jason

GH85Carrera 08-13-2020 11:44 AM
Quote:
Originally Posted by LIRS6 (Post 10984140)
My choice, I'm glad i did it. Where I feel I got screwed was the cost for re-build of alt.

Jason
Yea, that rebuilder charged you some NYC 5th Avenue rent rates.

ClickClickBoom 08-13-2020 11:54 AM
Quote:
Originally Posted by GH85Carrera (Post 10980458)
I will say it again, just get the Porsche branded fan belt. It is the right size, and has the right angle to the sides of the belt. Yea, it is expensive, but it works like it is supposed to without moving shims around.

I went through a couple of aftermarket belts and could not get them to fit right. The Porsceh belt is perfect fit. Almost like it was designed for the car! ;)
Or get the Clewett pulley system and flat ribbed belt. I installed and wouldn't consider going back. I have a thread somewhere. Modern technology for power transmission. But then I also replaced the alternator with a new design Nippondenso. The original 911 alternator was at its potential limit for amperage and design, the ND produces 95amps off idle and 140-170a depending on power transmission efficiency. If you use A/C ad drive in the city its the answer.

RDM 08-15-2020 09:13 AM
Quote:
Originally Posted by LIRS6 (Post 10978862)
Alt removal/refitting was a pain but gave me a chance to get some wrenching in and learn more. Looked on line including our host but could not find a sure-fit alt with external VR, and I did not want to go the route of the mod to internal. Brought alt to a local shop and they rebuilt it soup to nuts, but hammered me on the cost ($385). Went to work at the re-installation and kept my fingers crossed that a) I would get alt light with key turned, and b) that when engine fired the light would go out, and the alt would be charging.

Success!:

>snip<

As a footnote, I replaced the 10 x 725 belt with a 10 x 710 belt; 3 shims inside/3 shims outside and it was good to go.

Jason
I love a happy ending!

Now, back to redline!
>post 1500!<


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