Technical HB Blower boost gauge hookup

I don’t see an inlet port between the blower and intake manifold to connect a boost gauge. It’s an older Hampton Blower.


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You may have to drill a hole and tap it 1/8” pipe thread in the intake manifold to hook up the boost gauge most blower intakes do not come with one


Chrome don’t get ya home

 

Thanks, you would think it’s standard, you need to know the boost pressure


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It would be between lower flange of blower and engine? ....Thanks wrenchbender


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Maybe drill and tap the pop off plate.... That should be easier... No????

 

Drill and tap is the answer , twist a small coil in the tube for vibration and back fire protection .

 

Good idea, ...Thanks



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Sounds like tuner turbo talk.
It's traditional to talk about % of under or overdrive.

 

If it hauls *** and isn’t spitting red hot chunks of aluminum or spark plug electrodes out of the headers, who cares?
Me, I’d rather have an AFR meter. [emoji41]


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It should be traditional to have a boost gauge hooked up to the dash or hanging off the side of a blower... That way you can watch what the blower is dishing out when you "git" on it....

 

Probably why you can give away a McCulloch (sp) boost gauge these days...

 

In my limited experience, early blower intakes usually don't have a hole for a boost gauge, but later ones do. If you're building a traditional car, I guess that means you don't need to know the boost.

 

Boost pressure is really meaningless and quite misleading unless you know the intake air temperature as well. Something about that pesky Ideal Gas Law. Manifold Air Density is much more valuable from a tuning perspective.

Don't take my word for it. The Professor of all things boosted has a pretty good write up on the subject as well.

https://official.bankspower.com/density/

 

The funny thing about a boost gauge is that any time it would show a useful number, I'm way too busy driving to look at it.

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In our traditionalist world boost is more relative than an expensive gauge that ****yzes things six ways to Sunday. I think I’d have to go back to school to know what I was looking at with the Banks gauge.
If I know I can get away with 4-5 lbs. boost at 15% under with an 8.5 compression ratio then I’m aware that I’ll lose a few ring lands if I overdrive 15% on pump gas.
I wanted a blower since I was a kid, they just looked like the ultimate and I’m not out to set any records, all I want is a reliable, strong running street engine that returns decent mpg for what it is.

 

A boost gauge is similar to a tachometer. You look at the tach to make sure you don't go over 7K rpm or you might be picking up parts. You look at a boost gauge to make sure you don't go over 10psi or you might be picking up parts.

It is just a gauge that provides information, use it however you wish.

Also, if you have a port for a gauge it will usually be in the rear of the manifold closest to the firewall somewhere by the blowoff valve.

Good luck -Abone.

 

I did this^^^^

 

Thanks guys, I found a large Allen set screw on the lower flange of the HB Blower, it could be there as a port to connect a boost gauge or something that shouldn’t be messed with. Here are more pictures....any thoughts [emoji16][emoji106][emoji106][emoji106]

Thanks



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Just as a matter of interest, how long have you owned this car? Is there a reason you need to knw the boost pressure?

 

Looks to be a 1/8” NPT plug and yes, you can connect a boost gauge there.

 

I have an exhaust thermocouple left over from tractor pulling days, would help some, maybe more than a boost gauge?

 

Well, since I run McCulloch blowers, if you've got one to give away let me know. One's on evil bay at $550.00. I'll pay the shipping.

And it's a repop.

 

Never hurts to know boost, Hi boost = high octane rating. Just installed fuel pressure gauge because blowers/carbs need constant pressure usually around 5lbs.


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Works pretty good, don't it????....

 

On a displacement blower with no kind of active boost regulation the boost should be relatively stable, what you had at full throttle and 4000rpm on monday should be there on friday too. So if you just want to know what max boost it can produce you may as well just hook up a gauge once and take a test drive, then you know what you get. You can put the gauge back on the shelf until next time.
On the other hand, if you want the gauge there permanently it can indicate when you have a problem, when worn parts, leaks etc. change the boost pressure.

 

A boost gauge is useful if something fails, such as a blower to manifold gasket. I like a lot of info when I'm troubleshooting, have boost/vacuum, EGT, and Air/fuel ratio gauges on my Hemi. The EGT gauge is good if you're tuning over a distance, like a road trip, but it's action is far too slow to be of help on a quick run through the RPM range. The air/fuel gauge is useful all the time for tuning and keeping the engine safe. Reading plugs on a blown street car is about useless.

 

When I ran a TAFC the boost at top end
Was 45 lbs.
I was more concerned about EGT.

 

yes, this is the port where you connect the boost gauge. Just remove the plug.

 

Yes it did and since it was afterthought it sure beat pulling the intake off and drilling/tapping.

 

Cool!....