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Author Topic: 44mm IDA Venturi, jetting suggestions  (Read 13509 times)
leec
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Posts: 2584


« on: February 27, 2013, 11:01:14 am »

Hi guys,

Know this is a tricky one, but can anyone suggest base jetting for my motor. I currently run 40 vents in my IDA's (48 carbs) but want to up the Venturi size to 44 to match the inlet valve size, purely to see if I can extract a touch more go and better my pb at UK Drag Day.

Brief motor spec

2276cc
FK87
10.3:1 CR
44x37.5 Wedgeports with quick clean up

I already have 40mm vents and jetting to suit that, I don't have a huge amount of time to test various jets and cost with that, can anyone suggest a tried and tested jetting?

Thanks,
Lee
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richie
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Posts: 5620



« Reply #1 on: February 27, 2013, 11:29:18 am »

Hers the nearest i got

2332
48 idas,44mm vents
fk89,
untouched wedgeports,44x37,cb650 springs
just flycut for compression


thought you were going to dyno it?

cheers richie
« Last Edit: June 30, 2016, 15:49:21 pm by richie » Logged

Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
leec
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Posts: 2584


« Reply #2 on: February 27, 2013, 13:17:55 pm »

Hi Richie,
You know everything Grin
Was going to dyno but to be honest I've not got a lot of free time due to work and 2 year old commitments!!
What CR is Jo's car running. The jetting you list above seems very similar to what I already have iirc!

Thanks
Lee
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Shane Noone
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Posts: 267


« Reply #3 on: February 27, 2013, 13:54:11 pm »

Hi Lee,

I sent a message to Matt re valve guides so just waiting for him to reply. Ta

Re your chokes and jetting. What is your current mains / emulsions / airs ? on the 40 vents.....
Dyno / Rollers is the only way as you know but going from a 40 vent to a 44, I would imagine your main jet will need to go up a fair bit. The airs may not really need to change that much. F2 emulsions are suggested by many once you go to a 42V and that's what I now have in mine with a 44V. As for the rest my jetting probably not much use due to differences in head setup.

Hope you get it sorted and see you at drag day ( I won't be racing now so plenty of time to chill absd watch you guys ! )

Shane.
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richie
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Posts: 5620



« Reply #4 on: February 27, 2013, 20:04:28 pm »

Different engine Lee, high 11s compression so a little more than yours,and no I dont know it all,not by a million miles,but if I got some actual facts that I did myself I am happy to share Smiley


cheers Richie
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
leec
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Posts: 2584


« Reply #5 on: February 27, 2013, 20:48:29 pm »

Assumed you meant Jo's. I'm going to see what jets I have already and go from there. Will do a few runs on the set up you mention and go from there. Might owe you a tea if it goes quicker Grin

Lee
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Neil Davies
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Posts: 3437



« Reply #6 on: February 27, 2013, 23:04:05 pm »

I'll have a look in the attic when I've got a spare minute for my old logging book, it should have a list of the jets I used in my motor, it was a 2276 with an Fk87 and around 10.6:1 comp IIRC, definitely used 44 vents tho. You've already gone quicker than I did so I might not be any help at all! Cheesy
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2007cc, 48IDFs, street car. 14.45@93 on pump fuel, treads, muffler and fanbelt. October 2017!
neil68
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« Reply #7 on: February 28, 2013, 03:20:17 am »

My 2332 cc has the following 48 IDA jets, after some test and tune:

F7's then F2's
65 idles
180 mains
210 airs
45 vents

10.7:1 CR
Raptor camshaft 06908 (10.8 mm/0.425 lift, 274 degree @ 0.050"/1.27 mm)
1.4:1 rockers
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Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:  https://www.youtube.com/watch?v=M9B_H3eklAo
adrian
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Posts: 32


« Reply #8 on: February 28, 2013, 09:58:23 am »

I had a 2442 with fk87, 10.5:1, 42mm vents, 185 mains, 200 airs. 46 x 37 wedgies, made more power with the 42 s than 44 s ( on an engine dyno).
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leec
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Posts: 2584


« Reply #9 on: February 28, 2013, 10:19:24 am »

Thanks for the replies.

Going to see what happens at drag day. Going to use an LM1 and see what happens to the E.T's with the 44 vents.
The motor is very streetable at present so can't help but think with bigger vents/jetting a sacrifice in low down performance may increase horsepower at the top end.

Lee
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Shane Noone
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Posts: 267


« Reply #10 on: February 28, 2013, 11:30:44 am »

Lee, when my motor was first dyno'd at JMR with 46 vents to match the intake valve size, it made the most power as you are thinking but wasn't nice to drive on the street. We then switched back down to 44 vents so one size smaller than intake valve and lost 3 bhp but drivability was improved on the street. Than main jet also came down from a 190 with the 46 to a 180 on the 44.

Trial and error with the LM1 sounds promising. Good Luck.
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leec
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Posts: 2584


« Reply #11 on: February 28, 2013, 14:26:16 pm »

Hi Shane,

It may not work out any quicker, I'm just concerned I haven't ever changed the set up of the motor since I built the car (mainly because it did better than I ever expected) and just curious Grin

Lee
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Shane Noone
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Posts: 267


« Reply #12 on: February 28, 2013, 15:54:27 pm »

Hi Lee, I know, it's the what if Huh? scenario  Grin

As we've talked about before, I agree think your bug / motor / tranny combo exceeded expectations based on the spec. Which is awesome. I'd be well chuffed at sneaking an 11 out of my street driven / street legal ride. How cool is that.

I hope get deeper into the 11's mate at Drag Day  Shocked see you there bud.
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leec
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Posts: 2584


« Reply #13 on: June 26, 2016, 18:14:07 pm »

Right, in order to try and beat my mate Harv, I am considering trying the 44mm vent set up again. When I tried it a few years ago I broke my gearbox so never got to fully test the set up.

Lee
« Last Edit: July 04, 2016, 08:07:50 am by leec » Logged
herbieharv
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Posts: 298


13.5@99.5mph virgin


« Reply #14 on: June 27, 2016, 18:26:53 pm »

This looks like fighting talk
 Grin
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I keep meeting cloned mates in other country's .....I'm getting worried there might be another one of me

15.00 secs in a jumbo ... Mile high club member
leec
Hero Member
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Posts: 2584


« Reply #15 on: June 27, 2016, 20:02:30 pm »

This looks like fighting talk
 Grin

Looking forward to it Smiley
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herbieharv
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Posts: 298


13.5@99.5mph virgin


« Reply #16 on: June 27, 2016, 21:52:51 pm »

We might try the 44 vents at dragstalgia Lee , I've got my old time sheets to do we can compare what they are doing compared to the 42s in the car now
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I keep meeting cloned mates in other country's .....I'm getting worried there might be another one of me

15.00 secs in a jumbo ... Mile high club member
leec
Hero Member
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Posts: 2584


« Reply #17 on: June 27, 2016, 22:10:24 pm »

We might try the 44 vents at dragstalgia Lee , I've got my old time sheets to do we can compare what they are doing compared to the 42s in the car now

Copy cat  Grin
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Martin Greaves
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10.88@128.58


« Reply #18 on: June 28, 2016, 20:45:39 pm »

Harv have the new Rockers and Vents turned up yet.
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Hahaha your killing me.........
neil68
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Posts: 538



« Reply #19 on: June 29, 2016, 07:06:56 am »

I'm experimenting with the IDA's on my 2332 cc and the current jet stack is as follows:

44 mm Raptor vents
F4 emulsion tubes
185 mains
215 airs
65 idles
120 idle airs
3.0 mm needle valves
9.5 mm fuel lines
Raptor cam similar to FK47
« Last Edit: June 29, 2016, 07:11:02 am by neil68 » Logged

Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:  https://www.youtube.com/watch?v=M9B_H3eklAo
Jim Ratto
Hero Member
*****
Posts: 7121



« Reply #20 on: June 29, 2016, 18:54:05 pm »

I'm experimenting with the IDA's on my 2332 cc and the current jet stack is as follows:

44 mm Raptor vents
F4 emulsion tubes
185 mains
215 airs
65 idles
120 idle airs
3.0 mm needle valves
9.5 mm fuel lines
Raptor cam similar to FK47

Hi Neil
any hard numbers in running the F4 vs what you were running (F2)?
thank you

Jim
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leec
Hero Member
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Posts: 2584


« Reply #21 on: June 29, 2016, 19:35:12 pm »

..
« Last Edit: July 04, 2016, 08:08:48 am by leec » Logged
Martin Greaves
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Posts: 1740


10.88@128.58


« Reply #22 on: June 30, 2016, 22:05:14 pm »

Lee it's not just about changing the idle jet you also need to think about the idle jet holder as well.

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Hahaha your killing me.........
leec
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Posts: 2584


« Reply #23 on: June 30, 2016, 22:19:24 pm »

I see. Not clued up with this. How does that work then?
Lee
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DaveN
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Posts: 420


« Reply #24 on: June 30, 2016, 22:24:22 pm »

I used 65s on my 2332cc
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leec
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Posts: 2584


« Reply #25 on: June 30, 2016, 22:34:38 pm »

I used 65s on my 2332cc

But Martin said I can't just change to 65's?
Lee
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Martin Greaves
Hero Member
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Posts: 1740


10.88@128.58


« Reply #26 on: June 30, 2016, 22:45:53 pm »

No I didn't say that Lee.....

The idle jet controls how much fuel you get and the idle jet holder controls how much air you get for emulsification.

Best I call you over the weekend about it as it going take me all day to write it out on here.  Cheesy

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Hahaha your killing me.........
leec
Hero Member
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Posts: 2584


« Reply #27 on: June 30, 2016, 22:48:25 pm »

I'm with you! Thanks  Grin
I think I will stick to my current set up and when I actually get some time do some proper testing on a rolling road
Lee
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