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Old 12-28-2010, 05:57 PM
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Boost referencing power valves.

Since winter is now hitting us here in PA, I have alot of time on my hands. I have read the many posts on this site about boost referencing power valves and even though my car seems to run fine without the carb being referenced and my low boost (5lbs) I am going to reference my carb.

I have already locked out my vacuum advance distributor. I have my mechaincal timing at 28* as per some advice from members on this site. 18* initial and 12*mechanical.

My blower intake only has 1 port available to connect to under the blower. Is it ok to have my vacuum advance distributor, boost/vacuum gauge and for the boost referenced power valve on the same port?
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Old 12-28-2010, 06:50 PM
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Yes, you can "T" off of it. I went for two years without boost referencing my carbs, and finally melted 7 pistons when it leaned out at WOT for only about ten seconds. IMO all blower carbs need to be reference.
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Old 12-29-2010, 08:24 AM
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Old 12-29-2010, 08:08 PM
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Quote:
Originally Posted by 427blownvette
Since winter is now hitting us here in PA, I have alot of time on my hands. I have read the many posts on this site about boost referencing power valves and even though my car seems to run fine without the carb being referenced and my low boost (5lbs) I am going to reference my carb.

I have already locked out my vacuum advance distributor. I have my mechaincal timing at 28* as per some advice from members on this site. 18* initial and 12*mechanical.

My blower intake only has 1 port available to connect to under the blower. Is it ok to have my vacuum advance distributor, boost/vacuum gauge and for the boost referenced power valve on the same port?
You can tee off or drill & tap the manifold for another or as many vacuum taps as you want. Whatever end method you use, make sure the vacuum lines are held onto the tube, tee, whatever positively so they do not come off under boost.

If you have a automatic transmission that uses manifold vacuum for a modulator, THM 350, THM 400, Etc., it is a good idea to install a spring loaded check valve so boost won't enter your modulator.

Even with just 5 PSI of boost you still need to reference your carbs to the manifold below the blower.
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Old 12-30-2010, 10:51 AM
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Thanks for the information. Luckily the transmission is a t56 six speed manual and dont have a regulator. I will just have to "T" into the vacuum port to hook everything up. (gauge, distributor and power valve on 1 port)

Thanks for the link 68novass, I already have that write up saved on my laptop but I am definately not going that route. Once you drill out your powervalve protector there is no changing back. I have a quickfuel 950 and the carb was well over $750 when I bought it. If you do the power valve mod that way there is no going back.

I am going to plug the existing powervalve source with 2 part epoxy and then drill a seperate hole into the powervalve cavity to epoxy the vacuum tube into. That way the carb can be converted back to stock by plugging the new vacuum tube and clearing out the epoxy on the old powervalve source.
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Old 12-31-2010, 08:25 AM
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Quote:
Originally Posted by 427blownvette
Thanks for the information. Luckily the transmission is a t56 six speed manual and dont have a regulator. I will just have to "T" into the vacuum port to hook everything up. (gauge, distributor and power valve on 1 port)

Thanks for the link 68novass, I already have that write up saved on my laptop but I am definately not going that route. Once you drill out your powervalve protector there is no changing back. I have a quickfuel 950 and the carb was well over $750 when I bought it. If you do the power valve mod that way there is no going back.

I am going to plug the existing powervalve source with 2 part epoxy and then drill a seperate hole into the powervalve cavity to epoxy the vacuum tube into. That way the carb can be converted back to stock by plugging the new vacuum tube and clearing out the epoxy on the old powervalve source.
Just don't put anything that isn't loctite threaded on the under side of the base plate, unless it is covered by the gasket or the intake. You don't want the engine to ingest anything.
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