New Blower...LOW Boost !!

Well after I broke the shaft at the rotor on my 14:71 HH retro SSI blower I freshened the motor and installed a NEW Blower Shop 14:71 HH Retro,this thing has billet HA rotors,& billet case with full Teflon.They call it their race blower with all options set up for alcohol and it was very costly.The blower was also set back as required.The problem is it will not produce much boost.14 lbs at 55% and 17 lbs a 62.5 %.Boost is checked with the Edelbrock Qwik Data logger and is very reliable.It runs like it has no boost,I even has to lean it down a lot to even make it run compaired to what it took for the SSI. Same everything set the same way as before I even rechecked the degreeing of the cam.I called them and told the tech man about the problem and he said send it back to get it rechecked.About 90 dollars each way .I did check it after it was run and it still looks and feels good and tight.I have run less blowers with less od and made more boost. Any suggestion to why it does not make boost?

 

blower

I bought my littlefield from a guy that had a ssi and he told me the littlefield was junk compaired to the ssi even tough the little was a good blower I have never ran one but I do not think they compair to each other blower shop has some nice stuff though just my 2 cent let us know what you find out

 

Littlefield Junk!!!

Craig I agree with the guy who sold you the Littlefield,
I crew on a friends dragster JP1/Glide/50 over and he just got the new trick of the week blower from Mert with the K-11 rotors etc. We put the sensor all the way up front where it should get the highest reading and we can still only get 112 lbs at 8200
Many thanks to Littlefield on a job well done!!

 

my junk littlefield will make over 40lbs just rippin the throttle and about 48lbs @57 over in good air on the run after its been stripped but its an old blower 14lbs i would think it has to be leaking air from some where as for the 112lbs i have never heard of one making that much air when i ran an ssi d rotor blower fresh from ssi it only made low 50s @57 over my boost guage is on the dash in my car the ssi i ran in 01 and the littlefield that i run now is older than that


what kind of blower makes 112lbs any just curious



good luck

 

A really good one

check the back of the manifold where the blower seals depending on how far you moved it back the back of the blower may be hanging off the manifold and not sealing as the mert's still use the old seal surfaces

 

i know this sounds like a pain, but once i had a problem like this,so i removed the injector, covered the blower opening with a thick piece of lexan (or aluminum) bolted down so it seals, back off all the valves and hooked a regulator up to the manifold pressure outlet and tried to pressurize the whole manifold,and blower. low and behold , the o-ring under the blower was leaking after 10 psi. try that and listen for the air leak, if there is one, it won't take long to find.

 

blower

I am not bashing the littlefield I am running the so called junk blower It is working great it makes 25psi @25 OVER ON A 468 AT 7500 IN A JET BOAT WHICH IS LIKE BEING ON A DYNO I LIKE IT AND THE BOAT HAS NEVER RAN THIS GOOD AND JR FRESHENED IT UP I WAS JUST STATING WHAT I WAS TOLD TO ME BY THE SSI OWNER HE KNOWS WHAT IS GOING ON HELL I DONT KNOW jUST MY 2 CENT

 

Hey Chuck

Are You On Hre Drop Me A Line On There Hoolagans

 

HEY Craig,will do.
Mike... Yes it does use a adapter plate with o-ring sealing between both.I have been using this setup for a while with no problems. I installed fresh o-rings when I put it together. I have had a intake leak in the past but the leak was easy to see when you can see fuel coming out. I will make a top plate to seal the blower off and back down all the valves and pressure test to look for leaks and record my results. Thanks for the suggestions.
Chuck

 

Might seem basic, but look into the blower and make sure the rotors are in correctly. While not a common mistake, it does happen. And of course everyone is human.
Enjoy your day!
Darren

 

Hello Craig,

I know you were not bashing Littlefield, you had stated on your post as I had on mine that the guy who sold you the blower said Littlefield was junk.

As for the blower boost, I know the blower is not making 112 lbs of manifold boost the sensor was plumbed incorectly as stated but it is making enough boost so that we had to pull 5 degrees of timing to slow it down to where it ran before the blower update so to say we are happy with Littlefields product is an understatement.

Sorry for any confusion.

Richard Gavle

 

boost

Darren..I thought about that, but anytime I've seen rotors misspositioned, it never left the pits. Is it possible to run that way? I seem to recall they didn't like to rev at all. 3000 or 4000 tops

 

littlefield

the littlefield blowers are great blowers I'm a crew chief on a Nostalgia TF/FC and our rules only allow 18% OD and the littlefield makes 20 Lbs at 8000 but as for your problem just a thought is the new O-Rings that you put in a different size so that they don't create a seal or have you lapped your manifold and all of the other surfaces to be sure that everything is flat because if its not flat and there won't be a good enough seal when you see lots of boost it could be that also the O-Ring groove depth it too deep for your O-Ring if you had to change that for the setback change
Hope that helps narrow the problem down
Jake The Snake

 

Yea they will run and rev up as also. Of course not like you would want or expect. The discharge temp is abnormally elevated, and of course boost is down but they will run.

If a supercharger does not perform as expected the common problems are as follows. (Some seem basic)

-Rotors in correctly

-End clearances excessive

-rotor timing problems (normally if very bad the rotor will be waiving and screaming at you)

-Rotor profile issues (normally customer does not have the rotor he thinks he has)

-Rotor manufacturing issues (Teflon is not in the proper location thus not sealing opposing rotor properly allowing mechanical inefficiency and regeneration. The more grooves out of location the worse the unit performs)

-inlet starvation issues (normally restraint plate smaller than inlet opening, especially at the rear of the inlet port however ive seen all kinds of issues causing starvation, turbulence and airstream delimitation.

Enjoy your day


Darren

 

helped a guy with this same problem.....look very close to make sure that the end is sealed against the manifold...this guy told me that he was more than positive it was...wrong...what I did was take the rotors out of the case and look inside to see outside....use a bright flash light on the outside to see if you see any lite on the inside...I would say you will..hope this helps.Dave
www.myspace.com/daveloweswr

 

Never going to Quit ,The challenge is what drives me!

No spring loaded by pass & no burst panel. O-rings are new and the right thickness.The only time there was a boost issue was the intake gasket was blown. It could be heard when warming up & fuel would spit out.
The oil is not milky after two runs and no excessive blowby,so I don't think boost is going into the crankcase.I had to lean it down more than I wanted to because it was so rich on the first run.When I read the computer I was suprised how low the boost was. In the first burn off this thing was a animal but lazy down track,on the second run after leaning it down it started to run down track. Low boost= less fuel but down on my usual power level. When I find the problem I will let every one see how dumb I was!!Thanks for all the suggestions. Chuck

 

boost

thank you Darren.It's good to know you monitor this site. Congratulations on a superior product, leading technology and service.

 

No problem, and thanks for the kind words.
(It means alot to everyone here at DMPE)
Darren

 

just a thought..is the right gear on the right side and the left gear on the left??..Dave
www.myspace.com/daveloweswr