Alternator conversion bracket for 52 F-1
Thread Starter
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Cross-Country
Joined: Jul 2003
Posts: 86
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From: Evans,GA
Alternator conversion bracket for 52 F-1
Hello,
Looking for anyone who has experience with the Y, slingshot, wishbone type alternator conversion bracket that fits the alt. in the original gen. position on a 1952 F-1 239 engine with the 5/8's water pump pulleys. There are about 5 co's that I have found that offer these and 3 of them claim that they were made to fit the 3/8's belt passager car 239 and you must modify the alt. and the supplied spacer (by cutting them both down) to get pulley alignment on the truck which has 5/8's pulleys. The other co's had no idea that there was a difference. I have searched the site and found 2 persons having used these. One has a car engine in his truck and I'm still in the process of asking questions of the second, who no longer has his truck. So if anybody has info on this particular situation, I'd would love to hear from you.
Thanks,
M Joiner
Looking for anyone who has experience with the Y, slingshot, wishbone type alternator conversion bracket that fits the alt. in the original gen. position on a 1952 F-1 239 engine with the 5/8's water pump pulleys. There are about 5 co's that I have found that offer these and 3 of them claim that they were made to fit the 3/8's belt passager car 239 and you must modify the alt. and the supplied spacer (by cutting them both down) to get pulley alignment on the truck which has 5/8's pulleys. The other co's had no idea that there was a difference. I have searched the site and found 2 persons having used these. One has a car engine in his truck and I'm still in the process of asking questions of the second, who no longer has his truck. So if anybody has info on this particular situation, I'd would love to hear from you.
Thanks,
M Joiner
Laughing Gas
Joined: Aug 2006
Posts: 815
Likes: 4
From: mountaintop, Pa
I just posted on my setup. I did not have any trouble with alignment of the belts using a s12 delco alternator. I used their supplied spacer and modified my original generator pulley, but I've seen them for sale. I know I posted a link to the ebay auction for the alt mount. I thought there was an issue with it but I was wrong.
http://cgi.ebay.com/ebaymotors/Ford-...Q5fAccessories
http://cgi.ebay.com/ebaymotors/Ford-...Q5fAccessories
Thread Starter
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Cross-Country
Joined: Jul 2003
Posts: 86
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From: Evans,GA
Hey Bob,
I forgot you had posted pics of the bracket. You were having so much trouble getting belts on that I didn't realize you had it all together. So its looks like you have a Certified Auto Electric bracket via Ebay. If you measure from the front of the intake that the bracket mounts to, what # do you get? I measured mine with the gen back on and got 3.25 inches from the intake (between the fork in the gen. bracket) to the center of the original pulley. Is that a 12si alt? Thats the same one I want to use also. Suppose to be an improvement over the 10si. But, I have heard from several sources that the pulley should be 2.5 inches in dia. and not to use the original gen. pulley.
Thanks for the reply,
M Joiner
I forgot you had posted pics of the bracket. You were having so much trouble getting belts on that I didn't realize you had it all together. So its looks like you have a Certified Auto Electric bracket via Ebay. If you measure from the front of the intake that the bracket mounts to, what # do you get? I measured mine with the gen back on and got 3.25 inches from the intake (between the fork in the gen. bracket) to the center of the original pulley. Is that a 12si alt? Thats the same one I want to use also. Suppose to be an improvement over the 10si. But, I have heard from several sources that the pulley should be 2.5 inches in dia. and not to use the original gen. pulley.
Thanks for the reply,
M Joiner
Laughing Gas
Joined: Aug 2006
Posts: 815
Likes: 4
From: mountaintop, Pa
yes I get 3.25 to the center of the belt tot he intake mounting surface. the bracket itself is offset back further. I think I used the original pulley because it was very close in size to the on on this 12si. please let me know if you can confirm.
bob
bob
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Cross-Country
Joined: Jul 2003
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From: Evans,GA
confirm the pulley info?
This is from the fifth avenue garage:
The diameter of the alternator pulley is very important. In order to insure a
strong output from the alternator at idle and low rpms, it
is important that the alternator pulley be at or close to
(2.5") in diameter. Stock generator pulleys are too large
in diameter to be used on alternator applications. The
increased diameter will reduce the output of the alternator by 25% at idle and low engine rpms.
Fifth Avenue Internet Garage
Thanks for the numbers! That is that from the back / engine side of the bracket, right?
This is from the fifth avenue garage:
The diameter of the alternator pulley is very important. In order to insure a
strong output from the alternator at idle and low rpms, it
is important that the alternator pulley be at or close to
(2.5") in diameter. Stock generator pulleys are too large
in diameter to be used on alternator applications. The
increased diameter will reduce the output of the alternator by 25% at idle and low engine rpms.
Fifth Avenue Internet Garage
Thanks for the numbers! That is that from the back / engine side of the bracket, right?
Laughing Gas
Joined: Aug 2006
Posts: 815
Likes: 4
From: mountaintop, Pa
confirm the pulley info?
This is from the fifth avenue garage:
The diameter of the alternator pulley is very important. In order to insure a
strong output from the alternator at idle and low rpms, it
is important that the alternator pulley be at or close to
(2.5") in diameter. Stock generator pulleys are too large
in diameter to be used on alternator applications. The
increased diameter will reduce the output of the alternator by 25% at idle and low engine rpms.
Fifth Avenue Internet Garage
Thanks for the numbers! That is that from the back / engine side of the bracket, right?
This is from the fifth avenue garage:
The diameter of the alternator pulley is very important. In order to insure a
strong output from the alternator at idle and low rpms, it
is important that the alternator pulley be at or close to
(2.5") in diameter. Stock generator pulleys are too large
in diameter to be used on alternator applications. The
increased diameter will reduce the output of the alternator by 25% at idle and low engine rpms.
Fifth Avenue Internet Garage
Thanks for the numbers! That is that from the back / engine side of the bracket, right?
regarding the pulley that may be why I was having difficulty getting the correct belt... My gen pulley is 3" and the original alt pulley is 2.5" I plan to use a 3 wire set up on my alt having an excite wire to turn on the alt. but I may have to rethink this. I know one of the sites sells a 5/8" pulley I'll have to check into that I think it was only $15 but, I'll also have to get a shorter belt.
bob
Laughing Gas
Joined: Aug 2006
Posts: 815
Likes: 4
From: mountaintop, Pa
they don't state the size of the pulley.
The Hot Rod Company - GM Alternator 5/8" Wide Belt Pulley - Plain
bob
The Hot Rod Company - GM Alternator 5/8" Wide Belt Pulley - Plain
bob
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Thread Starter
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Cross-Country
Joined: Jul 2003
Posts: 86
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From: Evans,GA
2.5 dia. and DA plug
I got a 2.5 dia. pulley and a da plug for the alt. from ebay.
eBay Store - Kansas Select Products: boomless nozzles, granite counter support, 12 volt alternator conversion bracket
eBay Store - Kansas Select Products: boomless nozzles, granite counter support, 12 volt alternator conversion bracket
Laughing Gas
Joined: Aug 2006
Posts: 815
Likes: 4
From: mountaintop, Pa
I got a 2.5 dia. pulley and a da plug for the alt. from ebay.
eBay Store - Kansas Select Products: boomless nozzles, granite counter support, 12 volt alternator conversion bracket
eBay Store - Kansas Select Products: boomless nozzles, granite counter support, 12 volt alternator conversion bracket
what one did you buy?
Fleet Owner
Joined: Jul 2004
Posts: 27,283
Likes: 1,046
From: NM
Here is some useful info to understand what the vendors are saying; look at the very bottom.
Flathead Ford Waterpump Removal
Also a good comparison pic; you can see the truck pulley sticks out further from the block than the other (wide and narrow) types. So I guess my previous statements are wrong, there is a difference when using wide belts AND truck pumps; the alternator would need to stick out further forward. Depending how much that difference is, you could use longer spacers, or might need to beef up the bracket if it overhangs too much. (or convert to narrow belts?)
Flathead Ford Waterpump Removal
Also a good comparison pic; you can see the truck pulley sticks out further from the block than the other (wide and narrow) types. So I guess my previous statements are wrong, there is a difference when using wide belts AND truck pumps; the alternator would need to stick out further forward. Depending how much that difference is, you could use longer spacers, or might need to beef up the bracket if it overhangs too much. (or convert to narrow belts?)
Thread Starter
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Cross-Country
Joined: Jul 2003
Posts: 86
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From: Evans,GA
I bought the one that says 5/8 -3/4 for 10si alt. I have no idea if it is going to work. I still haven't bought the alt. or a bracket yet. I went back and remeasured. This time I tied a string around the crank pulley and streched it up into the gen. pulley. Then, I put a metal ruler in the space on the gen. bracket against the intake. The ruler crosses at 3 5/16 inches. I think I'm just going to order a bracket and try it.
Wide belt pulley 5/8" - 3/4" .670 bore 10SI alternator : eBay Motors (item 120387267754 end time Feb-27-10 14:56:46 PST)
Update: This pulley has a total dia. of 7/8 inches.
Wide belt pulley 5/8" - 3/4" .670 bore 10SI alternator : eBay Motors (item 120387267754 end time Feb-27-10 14:56:46 PST)
Update: This pulley has a total dia. of 7/8 inches.
Thread Starter
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Cross-Country
Joined: Jul 2003
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From: Evans,GA
Pully position
Ross,
Nice photo comparison. But, again the vendors are saying that alt. and the supplied spacer have to be cut down so that the alt. will fit closer to the bracket and engine. Their brackets were designed to work with the more narrow set up so when applied to the truck (and you add the wide pulley to your alt.) it (pulley) sticks out too far. I still haven/'t tried it yet, just what their telling me.
M Joiner
Nice photo comparison. But, again the vendors are saying that alt. and the supplied spacer have to be cut down so that the alt. will fit closer to the bracket and engine. Their brackets were designed to work with the more narrow set up so when applied to the truck (and you add the wide pulley to your alt.) it (pulley) sticks out too far. I still haven/'t tried it yet, just what their telling me.
M Joiner