Take a look at the pictures I have on the water pumps used by Mondello
and Winterfeld.
I think these are the TRW pump that most are using now.
Go to the page and use the search block on "pump"
gene
>Steve,
>Your absolutely correct that the materials of construction do not affect
>how the pump works. The design of the impeller is the whole secret.
>The newer pumps that has been sold lately by Cinnabar and others is an
>open impeller design, almost a paddlewheel. The pump that has been
>recommended for years by a lot of the GMC folks is a closed impeller
>design which is more efficient. If you check your Summit catalog you
>will notice that a majority of the high volume pumps offer a closed
>style impeller or there is even a kit to convert the open impeller to a
>closed style for more flow. This change has caused a lot of controversy
>within the GMC Net of which pump to use or is best. One comment earlier
>is the week was too high of a flow could cause overheating problems and
>that possibility depends on the condition of you entire cooling system.
>
>The real reason as I see it is that the older style pump with the larger
>enclosed impeller is correct is because our engines very rarely run over
>2450 rpm if you have the 3.07 final drive. If you have a different
>final drive, say a 3.46 or 3.55 your open impeller pump may be ok at
>speed but may be marginal at slower traffic. At these lower rpm's you
>need a pump that can move more coolant. The open impellers are of a
>passenger car design and they are designed to operate at a higher rpm in
>a smaller displacement motor. Without seeing the actual flow vs rpm
>curves for
>these pumps my guess is that they do not move as much coolant at the
>rpm's that our motors operate at. With the number of motors that this
>new pump fits my opinion is that it is probably marginal at best with
>the corporate thought that one pump fits all today. If you can find the
>old style impeller pump, get it!
>
>J.R. Wright
>GMC GreatLaker
>77 Eleganza II
>Michigan
>
>
>
>
>>
>> "oh you have read all of that propaganda have you,
>> well what the impeller is made of does not in any way affect how the
>> pump works".
>> Arch,
>> Take a look in your dog-eared Summit catalog at water pumps. The only
>> difference between the stock replacements and the "real" performance
>> ones is the anti-cavitation type of impellers used. Their design is
>> considerably different than the stock ones. There may also be a heavier
>> duty bearing or two in there also.
>> Steve Ferguson
>> San Diego, CA
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
http://www.california.com/~eagle/
and Winterfeld.
I think these are the TRW pump that most are using now.
Go to the page and use the search block on "pump"
gene
>Steve,
>Your absolutely correct that the materials of construction do not affect
>how the pump works. The design of the impeller is the whole secret.
>The newer pumps that has been sold lately by Cinnabar and others is an
>open impeller design, almost a paddlewheel. The pump that has been
>recommended for years by a lot of the GMC folks is a closed impeller
>design which is more efficient. If you check your Summit catalog you
>will notice that a majority of the high volume pumps offer a closed
>style impeller or there is even a kit to convert the open impeller to a
>closed style for more flow. This change has caused a lot of controversy
>within the GMC Net of which pump to use or is best. One comment earlier
>is the week was too high of a flow could cause overheating problems and
>that possibility depends on the condition of you entire cooling system.
>
>The real reason as I see it is that the older style pump with the larger
>enclosed impeller is correct is because our engines very rarely run over
>2450 rpm if you have the 3.07 final drive. If you have a different
>final drive, say a 3.46 or 3.55 your open impeller pump may be ok at
>speed but may be marginal at slower traffic. At these lower rpm's you
>need a pump that can move more coolant. The open impellers are of a
>passenger car design and they are designed to operate at a higher rpm in
>a smaller displacement motor. Without seeing the actual flow vs rpm
>curves for
>these pumps my guess is that they do not move as much coolant at the
>rpm's that our motors operate at. With the number of motors that this
>new pump fits my opinion is that it is probably marginal at best with
>the corporate thought that one pump fits all today. If you can find the
>old style impeller pump, get it!
>
>J.R. Wright
>GMC GreatLaker
>77 Eleganza II
>Michigan
>
>
>
>
>>
>> "oh you have read all of that propaganda have you,
>> well what the impeller is made of does not in any way affect how the
>> pump works".
>> Arch,
>> Take a look in your dog-eared Summit catalog at water pumps. The only
>> difference between the stock replacements and the "real" performance
>> ones is the anti-cavitation type of impellers used. Their design is
>> considerably different than the stock ones. There may also be a heavier
>> duty bearing or two in there also.
>> Steve Ferguson
>> San Diego, CA
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
http://www.california.com/~eagle/
