MGB Who has Modified MGB Air Cleaners?

[vping]

I'm looking to breathe a little better. What are my options for air cleaners and who has experimented with what? I recall somewhere somebody modifying the openings to the carbs or the aluminum spacers to get better airflow into the manifold.

I've also thought about, unless I saw it here too, using K&N stock shaped filters and having a top plate hold it all together. I can probably fabricate a top plate quite easily. Does that ring a bell?

 

[ronzi]

Don't know if you want to go with velocity stacks, but I made the end plates and used paper filters from NAPA.

 

[jlaird]

And that looks really professional, nice job.

 

[RickB]

Here is a picture from Hap, I've done this on my 70 MGB. (mine isn't nearly that pretty)

The thread where it's discussed is here:

https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/373416

 

[Hap Waldrop]

On my set up pictured above, you can also port blend match the stock velocity stack to carb throat, I deirect mount the stack with counter sunk fastner, you can use counter bore fastner, or even button heads if you like, I use no gasket, so I get a dead on transition from the velocity stack to the carb, here's a picture of the carb blending. The filters are Kn RU-4410 (corrct me guys on that part number to make sure I'm right), from Summit racing they run you about $50-60. Acouple of thing s these filter arrangement doesn that the other don't it real easy to take off nad on, one screw on the supply SS clamp and that's it, there are fancier set ups, but none any easier to work around, and best of all it real cheap, this is something guys have been doing at the race track for years, the short stock stack promotoe top end flow, per Vizard's veleocity stack testing, if any of you have Vizard A-series book, it's a good read, or eefernece to these type of subjests, even thought the book is wrote with A-series in mind all of the theory applies to B series engines as well.

 

[vping]

Those are some of what I was looking for.

Hap, would happen to have a layout/file for a rear engine plate?

 

[19_again]

Vince,
I've since switched to an aluminum plate from the Lexan, but the effect is the same.

 

[vping]

Are those stock filters or K&N replacement cartridges for the stock cans?

 

[WA1KWA]

If you could cut the Lexan in a circle to match the filters, that would look really cool.

Colin

 

[Hap Waldrop]

Those are some of what I was looking for.

Hap, would happen to have a layout/file for a rear engine plate?

Ok, we're were talking air filter Are you asking about the rear engine plate, and if so, no I don't have a drawing of it, Headley makes a aluminum back plate for the 4 syncro tranny set up.

I used one of Headley aluminum back plates on Fred McConnell's vintage MGB race engine, and have two more MGB race motors to build soon that will be using them. If you search on the MGex motorsports forum, a threat titled "Freddy is ready" you see pictures of it. It's on the owrk computer or I'd post it now.

 

[Hap Waldrop]

On thing about the KN air filter set up I used that promotes better flow, is the fact that no hardware passes thru the air filters, like alot of set ups.

 

[vping]

On my set up pictured above, you can also port blend match the stock velocity stack to carb throat, I deirect mount the stack with counter sunk fastner, you can use counter bore fastner, or even button heads if you like, I use no gasket, so I get a dead on transition from the velocity stack to the carb, here's a picture of the carb blending. The filters are Kn RU-4410 (corrct me guys on that part number to make sure I'm right), from Summit racing they run you about $50-60. Acouple of thing s these filter arrangement doesn that the other don't it real easy to take off nad on, one screw on the supply SS clamp and that's it, there are fancier set ups, but none any easier to work around, and best of all it real cheap, this is something guys have been doing at the race track for years, the short stock stack promotoe top end flow, per Vizard's veleocity stack testing, if any of you have Vizard A-series book, it's a good read, or eefernece to these type of subjests, even thought the book is wrote with A-series in mind all of the theory applies to B series engines as well.

Is the mounting plate modified other than countersunk for screw heads?

Is the opening to carb contoured?

 

[RickB]

That's how I did mine Hap, does smoothing out & matching the inlet make much difference? I know in racing you are looking for every improvement possible, for street use though is there really anything to be gained?

 

[19_again]

Vince,
Those are K&N's but I don't have the number, I think I ordered them from Tony.
Mike

 

[Hap Waldrop]

That's how I did mine Hap, does smoothing out & matching the inlet make much difference? I know in racing you are looking for every improvement possible, for street use though is there really anything to be gained?

Well there's always something to gain, without dynoing test before and after your guess is a good as mine, it can't hurt that's for sure