Jetting advice for 1904 street engine...

[mxracer]

I'm building a 1904 for my 73 squareback. No intention of racing etc. just trying to build a nice streetable engine with a little more torque/power.

Here's what I've got... looking for some input on initial jetting for my Dell 40's

OG AS41 case from a donor square, didn't even need align bored
CB 4140 74mm CW crank
Mahle 90.5 pistons and cylinders
Scat C25 cam and degree-able cam gear
CB 31mm big foot lifters
SCAT I-beam rods (vw journal, 5.394")
CB 1.25:1 super stock rockers
stock type 3 heads P&P and HD springs
CB chromoly pushrods
Tri-Mil over the top exhaust
Dell 40mm carbs with 30mm venturis (also have 28mm)
8.5:1 CR

Thanks

BTW jfasts808... not discounting your input here from when I got the carbs from you... I don't think I had everything nailed down then though

[DarthWeber]

I'd say 125 - 130 mains (w/30mm vents), 55 idles and 180 A/C will get you close. Nice motor BTW, good build for a Type 3. What CR are you running?
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52-53 idles for 40 DRLAs.
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[mxracer]

Thanks Darth (edit and John, you posted as I was typing originally)... I have a local engine builder that has helped guide me along the way so most of the credit goes to him. It is good hearing other input that it should be a good setup.

Was thinking 8.5 or 8.25:1 on the CR talking with him. Thoughts???

Jon (jfats808) seems to have nailed it with the limited info I gave him when I got the carbs from him too. They have 52 idle, 125 main, and 180 airs in them right now. Sounds like I at least have a good place to start.

[jfats808]

Dan,
I try.
Glad I got ya close bud. Good luck with your build.
-Jon
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2276 IDA's 86C 11-1 DD !
2017 48 Trijet DRLA's W125

[ALB]

Mxracer- is there a reason you went with the 31mm lifters?
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On a lifelong mission to prove (much to my wife's dismay) that Immaturity is Forever!!

[mxracer]

Honestly just to try them. The theory of them having a little more surface area and reducing wear makes a little sense to me. The rest of the specs seemed to be close to that of the other lifters out there so I figured I'd give them a shot.

The machining on them was nice and they spec'ed out just about perfect. I can't speak to longevity again but there's no indication that they are killing the cam lobes or flattening in 700 miles or so. Time will tell.