Are these Quincy pipes?

[Heliarc]

I was hoping that someone might be able to verify something for me. I have attached two pictures of exhaust pipes for an A or B deflector Mercury. If my fading memory serves me correctly, these are Quincy Welding pipes from the early 60s. They are steel pipes and there are two water relief holes at the top of the plate & two in the front of the plate. All four holes are drilled on an angle to spray water on the pipes and elbows. Any input would be greatly appreciated.

I bought these pipes just the other day. While they are pretty old, there is no evidence that they were ever used - not even bolted to an engine. I am glad to have found them. Quincy pipes?


Thank you,

Barry Rees

[Mark75H]

Yes, those are Quincy pipes

The reinforcing gussets and distinctive high quality welding give them away

[Heliarc]

Yes, those are Quincy pipes

The reinforcing gussets and distinctive high quality welding give them away

Thanks for your help, Sam. I appreciate it.

Barry

[Mark Crabtree]

Yes, those are 99% sure Quincy Welding pipes. Unless someone was an expert copier. And based on the age of the pipe, would tell me they are true Quincy pipes. I know, I have a set of them.

Mark Crabtree

[Roy Hodges]

Yes, those are Quincy pipes

The reinforcing gussets and distinctive high quality welding give them away
.................................................. .................................................. .................................................. .......................Many years ago , talking to Lon Stevens , he told me that Quincy pipes on a STOCK Mk55H (4 pipes) put out more power than his own 2 pipe system, BUT, a full house Mk55h would get more gain with his two pipe system. Why is that ? size /and or length of pipes ?

[Mark75H]

Paul Christner says the dyno logs from Quincy show that the one pipe per cylinder Quincy stacks always pulled the most power on the dyno. But - the converging pipes help motors with less peak power win races. Racing isn't who has the most power or who can run the highest top speed, it is who is "firstest" as someone said long ago.

I have a set of converging pipes made by Freddie Goehl, faithful copies of Quincys, and a set of Stevens pipes and feel that the Stevens pipes give more power. There are slight differences in the lengths overall, sizes at various points, the length to where the pairs converge and difference in the megaphone angle. I suspect the length to the merge may be the key. I could be completely wrong, it may be some other factor or the combination of all of the differences.

Some years ago I asked O.F. if the length to the merge was critical and he told me that they didn't do much if any research into different lengths for the merge; it worked and that was enough.