Checked the archives but couldn't find much!

So I have a new 383 stroker in my 69....As long as I moving along the temp stays right at about 195 to 200...but at idle or real slow speeds it is getting pretty hot....near 250....once I get moving again it will go back down..

I have a high volume "Tuffstuff" waterpump (Short) with a standard cheapo Flex fan. I'm also using the original factory shroud with a 2 row Griffin aluminum radiator....Because of the short waterpump the fan is not all the way inside the shroud.....Could this be the problem?

Do I need to run electric fans or a Fan cluth setup???

I'm open to any and all suggestions!

Thanks, Dan

get rid of the cheapo flex fan. My 383 with similar setup but a derale 17" flex fan runs at 180, heats up a lil idling standing still, maybe to 190, drops right down is i rev it to 1200 olr so.

the fan and its placement can cause high temps.the fan should be about 2/3 of the way into the shroud. i delt with the same thing on my big block car and that took care of it.

Ok...so first of all....my fan actually is not even close to being inside the shroud....see pic

Also I forgot to mention that I deleted the heater and am just using a bypass hose to the manifold....Not sure if that matters

I am using the longest spacer I could find to extend the fan into the shroud...Will I need to go to the "Long" waterpump? If so I guess I will need to change all the pullies and possibly even relocate the alternator to the passenger side????

http://members.aol.com/radzik2/fan.jpg

are you sure that's the correct shroud?
a 67-68 small block shroud shoukd be 7.5" from the radiator tank to the edge.

Here's mine with the stock 2" spacer. My shroud is a lil shorter than a stock one, maybe half an inch.
http://www.camaros.net/forums/attachment.php?attachmentid=809&d=1147394546

Car is a 69

ahhhh, ok then you need a better fan AND a 67-68 shroud!

Ok....Just measured my shroud and It's 5" from Radiator to edge of shroud (6.5" overall depth)

Your shroud is Sweet.....do you know the part number for your fan??...They offer quite a few different ones in 17" diameter

thanks.

does 17003 come up?
it's made by Derale, 17", they come in a few different colors.

The 67-68 shroud is an inch longer, your is correct for a 69.

I almost forgot that I got a 67 parked right next to the 69 (under the cover)LOL...

Checked the 67 and yea that shroud will be perfect.....Thanks a ton!

That Derale # wasn't any good....It's probably this one:

#17017 17" Standard (CW) Stainless/Black 2 3/8" 5/8" 1 3/4"-2 1/4" 6 blade


Dan

there's a bunch of fans, mine is SS with a black center, but they all cool the same, damned thing moves almost enough air to blow the hood off the car.

Dan,



It is really not a question of the right pump or spacer or even depth of the shroud yet a physics lesson. The fan needs to be placed just inside the edge of the shroud to do it's job as designed. When your fan is placed in the correct location it creates a vacuum chamber of sorts and sucks air through the encompassed area (shroud area). Different fans will pull different amounts of air at given speeds, but right now your fan is simply blowing air over your engine, which is why you are experiencing heat at low speeds/idle. Once you begin to increase the airflow through the radiator by driving the car the radiator takes over. Take a look at the link below to find the spacer that will get your fan inside the shroud. Measure the distance from your water pump flange to the edge of shroud & add 3/4" to properly position the fan at the optimum location in the shroud.

These spacers are priced around $10

http://www.derale.com/fanspacers.shtml


If you want to bump up the air flow a bit check out the Derale fans too! Due to the pitch of their blades these will put out some major air if spaced properly at idle and low RPM. They look great too; you can get a 17" or 18" fan with polished stainless blades and chrome center hub for less than $70

http://www.derale.com/hdflexfans.shtml

Thanks Jim & Rich....for the lesson....I am learning tons!

I think I am going to have to go with a 67/68 fan shroud and a new HD Derale fan.

If I went with just a different spacer it would need to be 3.5" long (which they don't even offer) ....I have a 2" one on there now and would need at least another 1.5" to get the fan 2/3 of the way into the shroud.

I figure with the 67/68 shroud it already is 1.5" deeper, which should be perfect and I can use my existing spacer....

Time to place some orders!

Thanks again,
Dan

This is 69 setup but gives you a visual perspective. 6 1/4" shroud and clutch fan setup with a/c. Runs consistently around 180, (thermostat is 180). A bit higher with a/c running but has yet to puke :)

http://www.brainerd.net/~knudsen/69RS/UnderHood/FanShroud%20005a.jpg