ET 967 Tuning Thread

[newbee]

thanks for the update. I thought i saw a guy running a wax tune on there 967
that post is so long now

 

[joecef]

thanks for the update. I thought i saw a guy running a wax tune on there 967
that post is so long now

Well I’m talking stock ignition. I’m going to run this till I get my hands on either sell or tl


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[newbee]

i thought it was 2mm about the thickness of a nickle for stock stroke

 

[joecef]

i thought it was 2mm about the thickness of a nickle for stock stroke

Okay cool. Haven’t used a stock ignition in a long ass time


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[joecef]

So I just ripped the carbs down. I’m running now


Carbs

105 main
145 pilot
2.5 n/s
Black spring

Pop off 10psi


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[newbee]

What carbs are you running again?

 

[Jcary85]

I’m no expert but 10 psi is too low. Try a 115g spring for 21psi

 

[joecef]

What carbs are you running again?

Novi 48’s


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[hink320]

I’m no expert but 10 psi is too low. Try a 115g spring for 21psi

Agreed, somewhere around 21psi would prob work a lot better

 

[joecef]

Agreed, somewhere around 21psi would prob work a lot better

Art got back to me. This is what he just recommended


135 pilot
125 main
17 psi pop off
2.3 needle
Silver spring


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[steve711]

Art got back to me. This is what he just recommended


135 pilot
125 main
17 psi pop off
2.3 needle
Silver spring


I am running on 48's novi
135
135
2.5 17-19pop off
90 jet on return line
Run clean and crisp

 

[joecef]

90 in line??

I just dropped down to a 60

I hate tuning


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[steve711]

90 in line??

I just dropped down to a 60

I hate

90 in line??

I just dropped down to a 60

I hate tuning


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Yes 90
To rich with the 60
You need 1-2 psi idle 2500rpm
4-5 psi 3/4 trottle to full

 

[550kid171]

Still tuning my novis 48s (ls1's) but am at 145 pilots, 125 mains, 2.5n/s and 19psi pop. Running pfp dry, total loss, pump gas, oem 155 with a skat 6/12 5mm cutback. Top end pulls hard but not quite happy with bottom end yet so going to bore my exit nozzle from 88mm to 90mm and see if that helps.

Did you ever open your nozzle to 90mm and did it help? Running a super similar set up at 87.75mm right now and feel like I’m missing out on a little on the pump end but also don’t want to go too big this early on in my tuning.

 

[tpars]

Did you ever open your nozzle to 90mm and did it help? Running a super similar set up at 87.75mm right now and feel like I’m missing out on a little on the pump end but also don’t want to go too big this early on in my tuning.

Not yet had some other issues to sort. Will be testing this weekend and if everything is sorted and nothing has changed will bore next week and report back after testing

 

[wmazz]

Pop off 10psi

I know this was already addressed, but peak fuel pump pressure
is ~7.5psi and idle is near 3.5 psi, no matter what size fuel pump
is used. You didn't list if your return line was modified, but if it
was not, I would expect it to load up on idle.


Bill M.

3.5 to 7.5psi from a small ~17cc weed wacker to a Mikuni high volume
pump.

 

[joecef]

I know this was already addressed, but peak fuel pump pressure
is ~7.5psi and idle is near 3.5 psi, no matter what size fuel pump
is used. You didn't list if your return line was modified, but if it
was not, I would expect it to load up on idle.


Bill M.

3.5 to 7.5psi from a small ~17cc weed wacker to a Mikuni high volume
pump.

My return is modified and I’m running a 60 main


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[tpars]

The 90mm bore did help with low end. Not a massive difference but was worth doing for my setup

 

[Storbeck]

Has anybody done the bottom end epoxy/porting themselves? Just buy the top end from ET and good oem bottom end and some epoxy and a die grinder? I'm wondering if this is a thing that can be successfully done by a more adventurous DIY'er or if you really need to buy a complete motor from a builder.

 

[550kid171]

Has anybody done the bottom end epoxy/porting themselves? Just buy the top end from ET and good oem bottom end and some epoxy and a die grinder? I'm wondering if this is a thing that can be successfully done by a more adventurous DIY'er or if you really need to buy a complete motor from a builder.

Cases have to be fly cut pretty big on a mill to accept the big sleeves on these. Might be able to do some notchy work with a die grinder but cases get pretty thin and its probably better to spend the $350 to have it done right.