[GoatZillaRacing]

Anyone ever compare a standard 8-71 to a Hampton 2 lobe? Liking the idea of a Big & Ugly with a non-stripped blower for fast big bucks bracket racing.

Talk to me...

[Jack Gifford]

I remember a Hot Rod Magazine comparison that included a 2-lobe blower, but it may not have been recently.
Why do you seem to be be lumping these together- 2-lobe and unstripped? Almost any Roots blower on the market can be purchased unstripped.

[GTOGEORGE]

Originally Posted by GoatZillaRacing

Anyone ever compare a standard 8-71 to a Hampton 2 lobe? Liking the idea of a Big & Ugly with a non-stripped blower for fast big bucks bracket racing.

Talk to me...

OK I've looked into a 2 lobe Hampton blower...........it sounds pretty good BUT I do have some questions. I wonder why they use no teflon stripping on the blowers lobes (with teflon strips you can run tighter clearances, hence more boost)? I also wonder why there really isn't no info on it since 2014? I asked them about using my blower and turning it into a 2 lobe but they said the cases (insides) are different. If the Hampton 2 lobe 8-71 doesn't work you WILL need a BIGGER blower to run the boost you are going to need to turn the ET's you are looking for! I ca only get 11-12 lbs of boost out of my 8-71 race blower. As for racing a blower in bracket racing, I suppose I'm the only one (Pontiac wise) that is doing it (successfully), of course I'm not running as quick as the ET's you are shooting for and for BIG BUCKS bracket racing you're talking a lot of laps ......9-12 rounds of racing. Normally the last 4 rounds the turn around is pretty DAMN quick! I have my car set up to be a one person operation so its not a problem for me. Lots of luck!


GTO George

[GoatZillaRacing]

Originally Posted by Jack Gifford

I remember a Hot Rod Magazine comparison that included a 2-lobe blower, but it may not have been recently.
Why do you seem to be be lumping these together- 2-lobe and unstripped? Almost any Roots blower on the market can be purchased unstripped.

Just because that's the way Hampton makes these 2-lobe blowers.

I like the consistency of an unstripped unit because the strips won't be wearing out as the day goes on and the 8-71 2-lobe, if it works as advertised will move more air than a 14-71.

[GoatZillaRacing]

Originally Posted by GTOGEORGE

OK I've looked into a 2 lobe Hampton blower...........it sounds pretty good BUT I do have some questions. I wonder why they use no teflon stripping on the blowers lobes (with teflon strips you can run tighter clearances, hence more boost)? I also wonder why there really isn't no info on it since 2014? I asked them about using my blower and turning it into a 2 lobe but they said the cases (insides) are different. If the Hampton 2 lobe 8-71 doesn't work you WILL need a BIGGER blower to run the boost you are going to need to turn the ET's you are looking for! I ca only get 11-12 lbs of boost out of my 8-71 race blower. As for racing a blower in bracket racing, I suppose I'm the only one (Pontiac wise) that is doing it (successfully), of course I'm not running as quick as the ET's you are shooting for and for BIG BUCKS bracket racing you're talking a lot of laps ......9-12 rounds of racing. Normally the last 4 rounds the turn around is pretty DAMN quick! I have my car set up to be a one person operation so its not a problem for me. Lots of luck


GTO George

The 2-lobe non-stripped (or any non-stripped unit) should in theory be maintenance free. It may put out more boost stripped but it would "wear out" the strips and become less consistent in the later rounds.

Like I said, I'm looking for someone who has actual experience to back up these theories. Thanks for the well wishes.

[Jack Gifford]

As for consistency of an unstripped blower, I totally agree. That's why I always ran an unstripped 6-71 on my hemi V8- totally maintenance free. My competitors were always needing to fiddle with tuning, according to condition of their Teflon strips.

As for a 2-lobe 8-71 moving as much air as a 14-71 3-lobe, I'd need to see data from a blower dyno to convince me of that.

[Tom Vaught]

Originally Posted by Jack Gifford

As for consistency of an unstripped blower, I totally agree. That's why I always ran an unstripped 6-71 on my hemi V8- totally maintenance free. My competitors were always needing to fiddle with tuning, according to condition of their Teflon strips.

As for a 2-lobe 8-71 moving as much air as a 14-71 3-lobe, I'd need to see data from a blower dyno to convince me of that.

X2

Eaton Superchargers has a "Blower Dyno" Jack. Lots of $$$$$$ for that bad boy. And the Wiring to feed the Motor to drive it was 1" diameter wire 3 phase. Electric Tug Boat type Power.

Tom V.

ps Have you ever noticed the effect of the discharge air (how it comes out of the blower), and its effect of cylinder to cylinder distribution?

[twooldgoats]

Originally Posted by Tom Vaught

X2

..........

ps Have you ever noticed the effect of the discharge air (how it comes out of the blower), and its effect of cylinder to cylinder distribution?

It definitely makes a big difference on my 10-71. I run bigger port nozzles to the front and smaller toward the rear. When I bumped it up to 10% overdrive last weekend, the two front cylinders ran even warmer, so I'll look at the Racepak EGT's and rebalance the port nozzles accordingly.

Jim

[Tom Vaught]

Some of the Production Eaton S/C Engines used a longer snout to try to get more of the discharge air in the center of the intake.
A Inter-cooler between the S/C and the Intake Runners helps that air distribution issue a lot but still not perfect.

Gale Banks played with using a Inter-cooler on Bruce Geisler Supercharged 53 Studebaker for a few years.
That helped distribution of the air and Bruce keep his engine together for the 7 mile runs.

Now, Jerry Magnuson flipped the supercharger around 180 degrees and used a secondary shaft to drive his units to try to get better discharge placement in the intake. Jerry was a good friend. RIP Jerry

In your case, you guys play games with the fuel amount put into the intake at different locations.
So you basically have 8 "one cylinder engines" each making a different HP.

Tom V.

[GTOGEORGE]

Originally Posted by twooldgoats

It definitely makes a big difference on my 10-71. I run bigger port nozzles to the front and smaller toward the rear. When I bumped it up to 10% overdrive last weekend, the two front cylinders ran even warmer, so I'll look at the Racepak EGT's and rebalance the port nozzles accordingly.

Jim

My back cylinders will run lean so i don't have "port injection" all i can do is richen everything thing up. i do run my back carb richer then the front but the way the blower is mounted it really doesnt make a difference.......but what the heck! The blower is mounted over the front cylinders so the the back cylinders "sucks hind tit", which is weird since the "retro" roots blower pusher the air and fuel mixture to the back BUT like i said i deal. Ive been jetting the carbs way, way up (204 jets from 192) and its has helped a lot with added power, i have 208's to go in for this year and expect even more HP! Most of the SH_T is just common sense stuff. a Racer doesnt need a be a Brain Surgeon! LOL! Blower stuff is pretty easy, like I said....just common sense!


GTO George

[GTOGEORGE]

Originally Posted by GoatZillaRacing

The 2-lobe non-stripped (or any non-stripped unit) should in theory be maintenance free. It may put out more boost stripped but it would "wear out" the strips and become less consistent in the later rounds.

I disagree totally a stripped blower should be just as consistent as an non-stripped blower BOTH should be just as maintenance free! The idea is with the teflon or what ever is to be able to have tighter clearances period, in later rounds (and I have been 9 rounds in one day and the last few have been round robin) I haven't noticed a difference....seriously i would know, been doing it a while with a blower Gas and Alcohol! Hell I would worry about the weather changing for morning to night time then the clearance of the blower. LOL!
Let us know what you can find out about the Hampton 2 lobe, i would love to know....thanks!

GTO George

[Stan Weiss]

GTOGeorge,
What you are saying is that something else in the blower will need maintenance before it needs to be re-stripped? The question is not consistence at one race but over the whole race season.

Stan

[GTOGEORGE]

Originally Posted by Stan Weiss

GTOGeorge,
What you are saying is that something else in the blower will need maintenance before it needs to be re-stripped? The question is not consistence at one race but over the whole race season.

Stan

Ive had my BDS blower like forever and have had no problems. Had it on gas first then alcohol, i sent it in to BDS after heck 5 years of more (id have to check) and they called me saying that everything was good in it....I told them to put new bearings in it and re-strip it anyways. Lots and lots of Racing passes on it! By the way the blower rotors are not suppose to touch the side of the blower....hence no wear and yes I know the bearings will wear (just common sense)! FYI


GTO George

[JSPONT]

OMG did you guys read the poor guys title of the thread? He probably keeps checking back seeing all the activity, but nothing he can use.. Sorry for de railing this question further. I have no info on it.

[GTOGEORGE]

Originally Posted by JSPONT

OMG did you guys read the poor guys title of the thread? He probably keeps checking back seeing all the activity, but nothing he can use.. Sorry for de railing this question further. I have no info on it.

Post no.4 from the originator is probably why the thread is going this way.
Actually I would love to read some info about the Hampton 2 love blower!
What I'm really curious about is how their 2 lobe picks up so much more air then a standard 3 lobe. B & M has/had a 2 lobe 6-71 and it only picked up around 11 cubic inches of air.

GTO George

[Jack Gifford]

Originally Posted by GTOGEORGE

... What I'm really curious about is how their 2 lobe picks up so much more air then a standard 3 lobe...

George, just look at the end view of a 3-lobe blower- notice how the area of the cavities is larger if you delete one of the rotors? [However, not "so much more" that a 2-lobe 8-71 could equal the displacement of a 14-71]

[Jack Gifford]

I'll join the guilty parties, and add to the hijack of this thread-

My M/T hemi V8 had the Vertex in the distributor hole, so the blower couldn't be moved back, and it suffered the usual poor distribution- but made even worse because of the equally-spaced intake ports placing the #7/8 ports back even further than a Pontiac head's paired ports. I initially had to run a very wide spread of port nozzles, but I reduced the spread significantly. I'm surprised nobody else has done this- I swapped the rotors left-for-right, so they tend to move the air rearward instead of forward. (Just had to dig out a 1950's Hot Rod article on tearing down a Jimmy blower!)

[twooldgoats]

Originally Posted by Jack Gifford

.....I'm surprised nobody else has done this- I swapped the rotors left-for-right, so they tend to move the air rearward instead of forward. ...

However, many of the newer blowers have the outlet at the front of the blower (teardrop-shaped), so reversing the air flow wouldn't work. Mine has this. Vince Mayeda set the blower back as far on the manifold as he could to overcome the problem. The downside for me is I can't run bigger than a stock-sized distributor cap. So far, that's only an inconvenience and not an operational problem.

I do wonder whether the different power produced by the different cylinders will prove to be an issue. So far, thirty passes without touching anything on the engine, except tune.

Jim

[GTOGEORGE]

Originally Posted by Jack Gifford

George, just look at the end view of a 3-lobe blower- notice how the area of the cavities is larger if you delete one of the rotors? [However, not "so much more" that a 2-lobe 8-71 could equal the displacement of a 14-71]

I agree, just wondering where their coming up with all the extra air.

GTO George

[Jack Gifford]

Jim- no need to wonder- better distribution of air definitely helped me develop more power with the hemi.

If your "retro" style setup is the early version (normal blower front cover) the manifold could be reworked to place the "pie piece" at the rear for reversed rotors. But if it's more modern (front cover that allows air to dump out the front end of the rotors) then I agree, you couldn't reverse the rotors.