New to this site & just got my first 14-71 !!!

Hi,

I have been reading a lot of really interesting posts on this site, much better tech that the HAMB, and much better roots blower info than LS1Tech.

I don't have an alcohol car, but it is on my list of things to do, first I have to get my semi daily driver to run a single digit pass at PIR.

I ran mid-10's with an ancient 8-71 bowers @ 12 psi, I just sold it to a guy in Sweden.

Now I have a pastel blue blower from San Jose.


So now that I bought it, I have a few questions.

1) What really is going to happen if i run this about 30% under on the street with 87 octane, then change pulley's and run 30(or more)% over on the track with 116 octane?

2) Does BDS make a good 14-71? I didn't find any thread or post about BDS on this site, perhaps they don't make race blowers?

Thanks for any input, feel free to be honest about the blower if is a POS it would be better for me to hear it now.

 

More on the blower

 

Bds

That is a great blower, we had one on a 526 bbc went 6.80 216 at 3210lbs.
If you post a top intake pick, can give more info. we had a high helix with K8 rotors. that design was sold to Kobelco. way back.

one or the original Engineers for BDS now is at superchargerusa.com call them

ps; you got that blower for a great price.

 

More photos





$1100 Not the cheapest I have seen, but I met the guy a few years ago, he is pretty cool, and I have a friend who lives about 10 minutes away in Los Gatos, he picked it up for me.

 

Milling out the top opening???

I think I want to mill out the top opening so that i can fit three AFB 750's.

Is that a really bad idea?

I know that any normal person would put on a injector hat or a pair of dominators, but I don't really think a mechanical fuel injection setup is the best choice for a drive to work type car, mostly because I don't really understand how mechanical injection works.

A pair of 1150 dominators are about 4 times as expensive as three AFB's for the same flow rating, and AFB's will probably idle better and get better cruise fuel economy.

 

You should probably call BDS and ask if you can run it on the street with carbs. I'm betting they will say no, because its too tight and so it will make too much heat and seize. That's what LF said about our 8-71 k8's.

 

That looks like an old Oddy blower by the colour and he did a lot of r&d for BDS

 

It's hard to tell buy the pics but it looks like a fuel blower?? the rotors look 60deg. Dave

 

Please help me understand a few basics about race blowers.

1. Do the white strips wear out faster than the black strips?

2. Is it correct that the white strips seal from rotor to case, and the black strips seal rotor to rotor (since the blacks are not on the tip they never touch the case, correct?)

 

Some info on my setup

Here is some info on my setup.

Tall Deck 427 block 4.310 bore deck cut .045, o-ring, .035 copper gaskets with hylomar
Eagle 4340 4.25 stroke crank
Speed Pro TRW-L2453F60 pistons
6.385 H Beam Eagle Rods

Canfield 350 cc heads, cnc 119 chambers, 2.300 intake 1.90 exhaust
Crower roller .660/.680 236/246@50
comp pro mag rockers with stud girdles, 1.625 dual springs
4l80E trans, 9" 4.86 spool, 28x11.50 ET Drags

 

the whites get replaced on mine more often than the blacks but i dont race that often but i replace the whites a couple of times a year mhen i do the match race deals did you say that is was a street car with a 1471 on it not sure what the maintenace will be

 

With that combo I would question the 30 OD at the strip. You have a good chance of a large pile of parts on the ground. The first to go would be the pistons. Boost is hard on none blower parts we learned this the hard [expensive] way. But hey good luck.

 

whites seal to rotor/case blacks are for r/r we now use whites in everthing we do all our blower stuff in house, when I see a down fall on the computer in boost I will service the blower..Dave
www.myspace.com/daveloweswr

 

I am not sure how much boost it will make at 30 over, the 8-71 with a smaller roller cam made 12 psi @ 15 over, and still made 12 psi@ 18 over

I guess I will see what OD it takes to get a 9.xx quarter mile, then if any parts are left I am going to start looking for a front engine dragster roller.

 

What about Snow performance type meth injection under the carbs that only operates under boost? This is a pretty common LS1 trick to bring down intake temps...