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Jetting noob :)
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Topic: Jetting noob :) (Read 5056 times)
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Jetting noob :)
«
on:
April 11, 2009, 20:42:39 pm »
I would like to know your thought on jetting for my new engine.
Setup:
DPR 69mm c/w
94mm mahle
Scat i beam
041 39x35.5 heads ported
Engle fk8
Straight cuts
etc.
And offcourse new 48 IDA's on big beef's.
I'm looking for a basic jetting to break in the engine and than start to jet it.
Something like this?
37mm vents
60 idle
165 main
F7 emulsion
200 air corrector
What jets should I buy extra? What is 'normal' to deviate from a basic setting?
Thanks!
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Der Vollgas Kreuzers
lawrence
Hero Member
Posts: 732
Re: Jetting noob :)
«
Reply #1 on:
April 11, 2009, 21:20:50 pm »
My engine is very similar to yours. The jets that you have now will work for the break in, but changes can be made to make the engine run great. What is your compression ratio? You should buy 50 idle jets and 60 idle holders. If they are too small you can drill them larger. See if you can borrow or rent someones jet drills. Your main jets are most likely too large; something from 130-145 should work better. The 200 air corrector is a good start; mine happens to be 180. F7 emulsions are fine, but see if you can borrow others to see how your engine responds. Remember that all engines are different so some experimenting is necessary. There is a good amount of IDA information on this forum, so pour a coffee and do some reading
Good luck and have fun!
«
Last Edit: April 11, 2009, 21:22:24 pm by lawrence
»
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"Happiness is a Hot VW!"
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #2 on:
April 11, 2009, 22:51:25 pm »
Thanks for your info
. CR is around 10.5 / 10 : 1
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Der Vollgas Kreuzers
Lanny Hussey
Full Member
Posts: 217
Re: Jetting noob :)
«
Reply #3 on:
April 12, 2009, 05:04:01 am »
IMHO, your guess looks pretty close although mains will likely be around 150. Keep in mind Doug Bergs saying 'the engine will tell you, not vise versa'
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1967, the only year that matters.
Rasser
Sr. Member
Posts: 488
Re: Jetting noob :)
«
Reply #4 on:
April 12, 2009, 09:04:33 am »
Still think that C/R is a bit high
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For a good time, call: 1-800-Cal-look
1955 type1
1966 type2 13w deluxe
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #5 on:
April 12, 2009, 09:49:25 am »
Thanks.
Do you think Rasser. Why? I have looked to calculate dynamic compression but I got different outcomes..
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Der Vollgas Kreuzers
Rasser
Sr. Member
Posts: 488
Re: Jetting noob :)
«
Reply #6 on:
April 12, 2009, 10:00:09 am »
If your intended use is mostly streetuse. Then it is just my personal opinion that 10.5:1 is too much for a fk8 cam. I would aim for 9.5:1. But offcourse opinions differ, I just wouldn´t wanna risk having an engine that gets too hot, or even worse "pinging" (pre ignition).
Have you looked at what C/R other people run with their fk8 cam, and what they use their car for (race, cruising?) ?
«
Last Edit: April 12, 2009, 10:01:47 am by Rasser
»
Logged
For a good time, call: 1-800-Cal-look
1955 type1
1966 type2 13w deluxe
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #7 on:
April 12, 2009, 10:01:54 am »
How much deckheight is to much? With 1.5mm deckheight I get 9.97:1. After 1.5mm it's better to gain some CC's I guess? To keep squish.
edit: @ Rasser. I got my CR from a topic you also answered to
.
http://cal-look.no/lounge/index.php/topic,7035.0.html
Will look in other CR. But mostly Americans run lower CR for the lower octane fuel. I'm going to run 98 octane.
«
Last Edit: April 12, 2009, 10:06:14 am by Jesse/DVK
»
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Der Vollgas Kreuzers
67worshipper
Hero Member
Posts: 727
Re: Jetting noob :)
«
Reply #8 on:
April 12, 2009, 10:03:49 am »
i agree with rasser.my cars running 8.5:1 with a fk8 and does the job without the hassle.dropping it a little would keep your nerves in check
should be sweet engine BTW
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vw hot rod heaven
Rasser
Sr. Member
Posts: 488
Re: Jetting noob :)
«
Reply #9 on:
April 12, 2009, 10:50:50 am »
Quote from: Jesse/DVK on April 12, 2009, 10:01:54 am
How much deckheight is to much? With 1.5mm deckheight I get 9.97:1. After 1.5mm it's better to gain some CC's I guess? To keep squish.
edit: @ Rasser. I got my CR from a topic you also answered to
.
http://cal-look.no/lounge/index.php/topic,7035.0.html
Will look in other CR. But mostly Americans run lower CR for the lower octane fuel. I'm going to run 98 octane.
Back then you talked about a w120 cam, but now you have chosen the fk8 - good choice!
I still think 10:1 is a bit too high. It could work just fine, but I would like to go down just a bit, and then not have to worry so much.
If your problem is that your heads have been cut down too much, then I would go for the 1.5mm deckheight, and check if you could safely remove some material (3ccm) from the chamber. Are the heads allready unshrouded for the 94mm bore?
Remeber dual springs!
«
Last Edit: April 12, 2009, 10:55:24 am by Rasser
»
Logged
For a good time, call: 1-800-Cal-look
1955 type1
1966 type2 13w deluxe
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #10 on:
April 12, 2009, 10:59:39 am »
They are now for 90.5mm. Will have them bored for 94mm and cut for dual springs. Will talk with the machine shop about unshrouding. The heads are 43cc now. I already have bugpack 4046 dual springs lying around.
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Der Vollgas Kreuzers
67worshipper
Hero Member
Posts: 727
Re: Jetting noob :)
«
Reply #11 on:
April 12, 2009, 11:19:12 am »
you should be able to get it down a little jesse
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vw hot rod heaven
Arry
Newbie
Posts: 19
Re: Jetting noob :)
«
Reply #12 on:
April 12, 2009, 14:04:39 pm »
Quote from: Jesse/DVK on April 11, 2009, 20:42:39 pm
I would like to know your thought on jetting for my new engine.
Setup:
DPR 69mm c/w
94mm mahle
Scat i beam
041 39x35.5 heads ported
Engle fk8
Straight cuts
etc.
And offcourse new 48 IDA's on big beef's.
I'm looking for a basic jetting to break in the engine and than start to jet it.
Something like this?
37mm vents
60 idle
165 main
F7 emulsion
200 air corrector
What jets should I buy extra? What is 'normal' to deviate from a basic setting?
Hi Jesse. I have a 1915 similar to yours, only with a 120 cam.
I'd say the jets are good, but I would try a smaller main (between 135-150). I have 135 on mine now, but with a 120 air corrector.
I feel the 10:1 comp is a little too high for a k-8.
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Run on pump gas
Rasser
Sr. Member
Posts: 488
Re: Jetting noob :)
«
Reply #13 on:
April 12, 2009, 16:44:16 pm »
If they are only 90.5mm now, then you should be able to remove some material on the sides of the chamber when they are bored to 94mm.
Logged
For a good time, call: 1-800-Cal-look
1955 type1
1966 type2 13w deluxe
Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #14 on:
April 12, 2009, 16:56:05 pm »
Ok guys, thanks for your answers. Think about going for 46ccs. 3ccs should be easy to get I think. With 1.5mm deckheight that makes 9.5:1.
About the deckheigt. What is better for temperatures? Shims under the cilinders to get a deckheight of 1.5 or set the deckheight at 0 and than install a copper head gasket of 1.5mm.
Thanks!
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Der Vollgas Kreuzers
Jim Ratto
Hero Member
Posts: 7121
Re: Jetting noob :)
«
Reply #15 on:
April 12, 2009, 23:28:30 pm »
Quote from: Jesse/DVK on April 11, 2009, 20:42:39 pm
I would like to know your thought on jetting for my new engine.
Setup:
DPR 69mm c/w
94mm mahle
Scat i beam
041 39x35.5 heads ported
Engle fk8
Straight cuts
etc.
And offcourse new 48 IDA's on big beef's.
I'm looking for a basic jetting to break in the engine and than start to jet it.
Something like this?
37mm vents
60 idle
165 main
F7 emulsion
200 air corrector
What jets should I buy extra? What is 'normal' to deviate from a basic setting?
Thanks!
that 60 idle should get you where you need to be but the idle and idle air holder has the most profound effect on street car overall performance, meaning you can work until 2020 on getting main jets to pull 4500-7000 but if the car runs badly off idle or in progression, you'll hate driving the car and end up being another guy that claims "48IDAs can't run good off ilde on street cars"
I'd come down on mains like other guys have said...make doubly sure float levels are PERFECT and ensure fuel pressure.
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Jesse/DVK
Hero Member
Posts: 817
'64 2176cc
Re: Jetting noob :)
«
Reply #16 on:
April 13, 2009, 15:50:39 pm »
Thanks guys for your help. Just set my floats today on 5.5 mm with help of the Haynes manual.
This is what I will start up with.
37mm vents
60 idle
150 main
F7 emulsion
200 air corrector. with the stock 120 air holder?
Anyone an idea about my deckheight question? What is better for temperatures? Shims under the cilinders to get a deckheight of 1.5 or set the deckheight at 0 and than install a copper head gasket of 1.5mm.
Logged
Der Vollgas Kreuzers
Bruce
Hero Member
Posts: 1420
Re: Jetting noob :)
«
Reply #17 on:
April 13, 2009, 17:40:38 pm »
Quote from: Jesse/DVK on April 13, 2009, 15:50:39 pm
What is better for temperatures?
It's not gonna make any difference either way.
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