Volvo RWD 140-160 Forum

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The old Carb question... 140-160

My mildly modded 142 Balanced, Blueprinted B20E (ports blocked), Minor porting, Schneider 270 cam (110 LSA), Oversize Ferrea Intakes, Double Valve Springs, .060 overbore, Elring head gasket (10.4:1) finally runs pretty damn well on a 123 Programmable tween 15 and 30 BTDC, idling at about 1100 RPM ON PARKER misadvised Mikuni HSR45's.... AFR read 14 at idle, 12.2 midthrottle,11.8 full; plugs look rather clean after a hard joyride

A friend offered to sell me a pair of lovely polished HS6's with unknown needles and springs for 400 bucks...

Would look really pretty on the intake I spent hours polishing ten years ago...

POWER loss or gain? One caveat in favor of SU's...the momentary blip coming off idle, and float bowls that weep after shutdown in summer... that I haven't conquered on the Mikuni's...

Just nitpicking....the SU's would look really PRETTY!








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    The old Carb question... 140-160

    If the SU's have absolutely no wear at the spindle bushes or have been properly refurbed to fix that issue they should suit you. If worn offer a lot less so you can afford to have them fixed. Needles are too expensive and the springs may well be correct but again not too spendy. Removing the needles to check often ends with them being bent so be careful. Probably KD/KN needed for at least the initial set up.








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    The old Carb question... 140-160

    What does 'Blueprinted' mean?
    What does 'ports blocked' mean?
    How much does the head flow?

    How many cc's
    Exhaust System?
    Schneider has several different lobes of the same duration: What is the duration @ .050" Lobe life & Total lobe lift?

    Twin SU's are GREAT for a mild engine with an inlet lobe like a D or K.

    HSR Mikunis are insanely oversize & I would never stick them on a twin (180°) 4 banger manifold. With Mikunis, ultimately, you want FOUR of them mounted on a I.R. intake: 38, 40 or 42. 45 is TOO BIG.

    A HSR 45 would be great on...... VPD's supercharger system.

    Cheers,
    Paul.









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      The old Carb question... 140-160

      A Google Link with pics of the engine work..

      https://drive.google.com/drive/folders/1UVJwsA402E-_5fW1IJeSahgOLXLuNvJs?usp=sharing








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      The old Carb question... 140-160

      Gee Paul...

      Maybe I misspoke my engine terms... it's a standard B20E...if you're a Volvo guy...you know it came to the States with FI for fuel input, therefore it has extra holes in the head for the injection tubes...extra holes, which left unplugged would make compression impossible...some people call them "ports"...even nowadays ...car manufacturers call it direct port injection.

      Never figured out the CC's...needed new pistons cause the old cylinder bores were wonky...Mahle only had .060 pistons available at the time, so we bought them...I think that makes it a 2030 cc or something.

      Schneider calls it their 274 cam...I think that means 274 degrees, when I bought they said it was 110 degrees of "overlap...and ground for powerband between 2500 and 4500...and I think the spec page says .426 total lift..

      The blueprint part could be a misnomer....but it means the head mechanic measured the cc's in water for each head chamber, and added/took away until they were exactly 48cc's each...

      The exhaust is a ceramic coated inside n out B20E separate exhaust manifold, with a standard dual outlet downpipe with 6" extra added to each pipe into a custom 2 into 1 collector ending in a welded 2" system, with 2 Giant(I think 12 x 20) Magnaflow mufflers with a single tailpipe behind the driver wheel...

      We didn't have a flowbench available...so nix on flow parameters. I forgot to buy a dyno and put it in my carport, so I only have a "butt dyno"...

      I've been reading your posts for 25 years...used to love the interplay tween you and Singher, and George Downs, and Eric, and Kyle

      I bought them anyway...they look great, but I had to get float seats ordered cuz they both overflow terribly...ALA Mikuni...oh well...








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        The old Carb question... 140-160

        I should have read this 1st.

        .426" lift sounds stockish, do you have dual springs? Schneider tends to have 2 or 3 different profiles for each amount of duration, I'll look at their site. 110° would refer to LSA, it's the angle between the inlet & exhaust lobes. After you degree the cam in, you should have the inlet lobe centre at 106°, the exhaust at 114°, this gives 4° advance, the place 95% of 2 valve engines end up at.

        For future reference, B20E exhausts are 2.125" & Volvo originals are very high quality & straight through. I'm not up to speed with magnoflows products, I know they have some good straight through types, so long as it's NOT a 'triple flow' or 'turbo' style.

        Compression & Cams: With an E gasket, you are probably at 10.4:1. High compression & low compression cams are two different things, next time around, I'll tell you would you should have got, provided this cam did break in properly & it has 8 lobes still :)

        Your float problem, the spring in the mechanical pump is what controls the pressure, it won't be a problem. The B20 is a bit of a shaky one & higher compression makes them worse, that can send the needle & seat off. What I said in the other post about that applies. Your other problem, besides flooding, is the emissions throttles, if they have them, or the vacuum hoses the wrong way around, or something more simple like one of the choke idle screws.

        Cheers,
        Paul.







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