make my brumby go harder!
make my brumby go harder!
hey guys, now that i have a working motor, what are a few simple and cheap things i can do to make the ea81 go a bit harder, and how much fuel efficiency do i have to sacrifice?
- tim_81coupe
- General Member
- Posts: 1693
- Joined: Tue Oct 04, 2005 10:00 am
- Location: Perth
I seriously doubt that, GTLegs. I hardly think two Weber's would make any increase in power, the Weber is that much bigger a carb than the Hitachi. You'd have flow problems in the manifold & heads well before needing to upgrade from a 32/36.
82 MY Wagon, EJ20G
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
Of course there is the REALLY cheap mod you can do to the standard EA81 carby......"The Wire Mod".
I beleive you get a piece of thin handywire and stick it in a certain place which effectively changes the secondary jets from vacuum operated to mechanically operated.
Not too sure on the particulars, somebody who's actually done it could go into more detail
I beleive you get a piece of thin handywire and stick it in a certain place which effectively changes the secondary jets from vacuum operated to mechanically operated.
Not too sure on the particulars, somebody who's actually done it could go into more detail
That is how the standard Hitachi works - vacuum operated secondary butterfly! You need to over ride that by using a piece of wire to the primary linkages so they operate in unison. (not sure if thats correct as I havent done it myself, only seen the mod on posted on this board. The mod may mimic as described below)
The Weber secondary is staged to open proportionally at a percentage of the primary movement. The 32/36 DVG Weber is around 300CFM, a max flow that would not be achieveable as Tim said for those reasons.
The Weber secondary is staged to open proportionally at a percentage of the primary movement. The 32/36 DVG Weber is around 300CFM, a max flow that would not be achieveable as Tim said for those reasons.
- tim_81coupe
- General Member
- Posts: 1693
- Joined: Tue Oct 04, 2005 10:00 am
- Location: Perth
Very roughly I'd say about $200. ~$50 for the carb from a wrecker, ~$50 for an adapter plate, ~$50 for a rebuild kit and ~$50 for the unknown. Cost starts going up if you can't rebuild it yourself, I'm lucky enough that I've never had to rebuild a carby (always kill the motor first ) so I can't really suggest what it would cost.
82 MY Wagon, EJ20G
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
- steptoe
- Master Member
- Posts: 11582
- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
Birdy, just think of the carby as a house with bits n pieces inside.
Take photos of before and during dismantle, take note of the jets sizes numbers and where they came from and where they go back
You can use (your own) chisel to scrape off old gaskets, prepsol or thinners like in laminex work is good to clean the metal parts in only (not the rubber bits, diafragms etc). Soak em and use your compressor to blow clean and dry
Straight and philips screwdrivers - you'd have them on your tool belt ! is usually all you need to undo things
Better still just find a mechanic that needs a pergola built or sumptin'
Just kidding, have a go, get a kit and if you get stuck jump in here and some one sure to help
Take photos of before and during dismantle, take note of the jets sizes numbers and where they came from and where they go back
You can use (your own) chisel to scrape off old gaskets, prepsol or thinners like in laminex work is good to clean the metal parts in only (not the rubber bits, diafragms etc). Soak em and use your compressor to blow clean and dry
Straight and philips screwdrivers - you'd have them on your tool belt ! is usually all you need to undo things
Better still just find a mechanic that needs a pergola built or sumptin'
Just kidding, have a go, get a kit and if you get stuck jump in here and some one sure to help
- steptoe
- Master Member
- Posts: 11582
- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
saw a guy the other day in an Aussie flag blue Brumby UTE89B tear arseing around, sounded good, went well. I suspected a nice mod providing his motorvation. Nuh, stock EA81 with head work and exhaust mods.
I was impressed.
There you go, find a set of heads, get em opened up a bit and serviced and see how you go. EA82 Y pipe / header pipe is said to be the go and a 2 inch zaust !
I was impressed.
There you go, find a set of heads, get em opened up a bit and serviced and see how you go. EA82 Y pipe / header pipe is said to be the go and a 2 inch zaust !