New AMM housing for LH2.2 w/larger injectors...on a budget

[ovlov760]

Purpose: Enlarge the AMM housing to better match larger than stock injectors and hopefully get slight better MPG and more airflow.

Results(so far): No resistors or pots are needed in the AMM wires to get the Volvo test light to function properly. In town driving i'm getting better MPG(driven 50miles so far). Taking a 2 1/2 hour trip tomorrow so i'll record the mileage if my gas gauge doesn't act up. Power gains.. with snow on the ground and wet pavement at the moment I can't really tell you :).

Pictures:
For starters I am using two PVC adapter pieces. The inlet is ID 2" and the outlet is 3". I have ground out the inlets inside and the ridge inside the inlet so they are slighty larger. The inlets and outlets on the completed piece are slighly over 2" and the middle is where the AMM is 3".
http://www.cramptonstation.com/AMMhouse.jpg

The two PVC pipes glued together with J.B. weld. The AMM is sitting in the location where it will be lowered in. I cut a retangle shape out of the pipes to fit the AMM in. Then the AMM was again J.B. welded in and surrounded in high temp. oil resistant gasket sealant to make it air tigh on top.
http://www.cramptonstation.com/AMMpipe.jpg

Inside the housing the AMM has been lowered in enough so that the wire is centered and the wire is reading the air flow where its strongest(in the center).
http://www.cramptonstation.com/AMMinside.jpg

I have sourced more parts for a different and theorectically better design which I will build soon. The new design will have no bell shaped smaller end on the inlet but will require me to buy a cone filter with a larger outlet. Yes........ I know it's ghetto and not pretty(eat me);). :roll:

[mAydAy]

Awesome. Just awesome. I love it. Its a smart way to fix a simple thing. Also, as a suggestion for next time, a small length of pvc pipe glued in holding the two connectors together would probably make it easier than just JBwelding them together. This design is particularly neat in that it can be customized for different size intakes and outlets, and its cheap! Looks to me to be a good alternative to adding in an AMM from another car, and seems easy enough to do.

[nothing but turbo]

:eek: :eek: :eek: :eek:

I already saved the pics... :-D

cool job man!

q: you'll be mounting a mesh at the both ends, like the original, or just leave it "as is"?

[Anonymous]

The B280 has a 3" AMM for LH2.2 and is plug and play, in case you bump into one at the bone yard.

[ovlov760]

I traveled 169.9 miles holding between 70-80mph and once or twice pushing to 90mph and made one short stop. I got 19mpg with the browntops and the larger AMM housing. I was in boost quite often but always below 10psi. I was using 93/94 octane gas.

[The Aspirator]

Could you maybe clarify something for me? My AMM has an outside diameter of 2 3/4", so the inside is just under that.... so how would your 2" inlet/outlet work better to reduce flow restriction? Or is the 3in "chamber" a benefit here? What about just a straight 3" peice of pipe? Or would too much airflow get past the heated sensor, defeating the purpose?

Either way, totally awesome job. Always great to see new ideas! And thanks for the tip on the B280 AMM 780! Even though I just ordered my Megasquirt 8-)

John

[WeezilUSA]

Did you try w/o the bigger amm housing first to see what diff it made?

[ovlov760]

This is the new design. It is not road tested though. Hopefully in the next few days my engine will be back together and I can test it for real. This time the diameter is 3" all the way back to the outlet where it shrinks to 2" to fit in the hose. The cone filter is very huge and i'm not exactly sure how i'll fit it yet :).

http://www.cramptonstation.com/redcone.jpg

[MikeB23ft]

So how did it go?

[Anonymous]

So how did it go?

I see he has a a problem posted in another forum, perhaps this mod does not work after all!

[ovlov760]

[quote:162508f63b="MikeB23ft"]So how did it go?

I see he has a a problem posted in another forum, perhaps this mod does not work after all![/quote:162508f63b]
But not a problem with the AMM. :roll: Keep on trollin!

[ovlov760]

So how did it go?
Went fine. Leans out the mixture and gets rid of the need for messing with the AMM wires. So far there have been no negative effects. It is ugly though. :e-shrug: . The problems in the other forum that the troll is referring to were caused by a failing Fuel pump relay and FPR.

[linuxman51]

[quote:6d568e18bb="MikeB23ft"]So how did it go?

I see he has a a problem posted in another forum, perhaps this mod does not work after all![/quote:6d568e18bb]

perhaps you dont have the balls show yourself :roll:

[mAydAy]

[quote:807e7b0928="MikeB23ft"]So how did it go?
Went fine. Leans out the mixture and gets rid of the need for messing with the AMM wires. So far there have been no negative effects. It is ugly though. :e-shrug: . The problems in the other forum that the troll is referring to were caused by a failing Fuel pump relay and FPR.[/quote:807e7b0928]
Hmmm, I may have to make me one of them thar thingys for my cars eventually...

[stylngle2003]

[quote:58866f2d3a="ovlov760"][quote:58866f2d3a="MikeB23ft"]So how did it go?
Went fine. Leans out the mixture and gets rid of the need for messing with the AMM wires. So far there have been no negative effects. It is ugly though. :e-shrug: . The problems in the other forum that the troll is referring to were caused by a failing Fuel pump relay and FPR.[/quote:58866f2d3a]
Hmmm, I may have to make me one of them thar thingys for my cars eventually...[/quote:58866f2d3a]

or mine, perhaps :e-shrug:

[mAydAy]

[quote:04aaa52a7d="mAydAy"][quote:04aaa52a7d="ovlov760"][quote:04aaa52a7d="MikeB23ft"]So how did it go?
Went fine. Leans out the mixture and gets rid of the need for messing with the AMM wires. So far there have been no negative effects. It is ugly though. :e-shrug: . The problems in the other forum that the troll is referring to were caused by a failing Fuel pump relay and FPR.[/quote:04aaa52a7d]
Hmmm, I may have to make me one of them thar thingys for my cars eventually...[/quote:04aaa52a7d]

or mine, perhaps :e-shrug:[/quote:04aaa52a7d]
Yeah thats even more likely :-P
I'll find you a new AMM sometime and we can cut it up and make you a nice big 3" intake for that 60trim. :-D

[ovlov760]

Not much new but I messed around with a 4" intake and found that to be too big for brown tops.... just FYI. Possibly a 4" would be a good match for CFI injectors which I don't yet have.

I've been getting about 20-27 mpg on the highway depending on how I drive. So far no problems with this setup. Ideally I think a 3.3" ID diamter pipe would provide the best A/F ratio with brown tops.

[Kakkarotttto]

Hey man, for some reason my A/F ratio gauge is no longer going into rich. I have the same gauge you do and it stopped going into rich. I had the resistors in, and i took them out and it ran richer when i took them out, and it just eventually stopped going into rich all together. What can i do yo?