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Title: Hybrid Heads L5/L7 from Aircooled.net ??? Post by: Motox166 on October 19, 2018, 07:26:33 am Well, my used used heads were different than I thought I was getting. I don't think th PO knew what he had. He sold them as a standard L5.
Specs that I have verified: 94mm bore 40x35 valves = L5 76 or 77cc intake runners = L7 64cc chambers Aircooled.net CNC'd in large print on the bottom fin. 049 castings Ports have not been touched since CNC'd from the looks of it. Was this a mistake somehow that got out the door? Did someone install smaller valves after new? Is this some secret racers trick: venturi effect with the medium size ports tapering down towards the smallish 40mm valve. I'm told by the PO that these are circa 2014. Should I go bigger valves to match the runners? If so what size? Having a local a vw machinist do the work, so is it worth the cost over buying new Panchitos for $600-700 or ??? BTW, paid $400. Building a: 2165 86c w/ 1.4s - thinking 106 LC? 10:1 Dual 44s 1 5/8 exhaust or 1 3/4? 7500 or 8000 max rpm Vw650 springs, Ti retainers As41 mag with bushed lifter bores, full flow Bugpack crank, pauter rods Shooting for 180hp+ at the crank Use: 70 Baja Bug, mostly a fun after work/ weekend warrior. Once in a while, play around in the Oregon sand dunes. 002 bus box, 30"x 13" sand paddles for sand drag racing and 32" for the street. P.S. I posted this on theS*mba also. But I like the the answers I get here better. Btw: Jim Ratto is my spirit animal. I like the way thinks! Title: Re: Hybrid Heads L5/L7 from Aircooled.net ??? Post by: Erlend / bug66 on October 19, 2018, 07:32:56 am The cam and rockers (0n 108LC at least) is good for that RMP. Not too sure about the carbs and heads. If the heads were from JPM, I would not question it..
Change them out with 044 mini or regular wedge ports. GREAT head for the combo. My 2110 on old style wedge ports, 86C + 1,4 and 1 3/4 exhaust turned 200 hp at those RPMs. But on IDAs.. :) Title: Re: Hybrid Heads L5/L7 from Aircooled.net ??? Post by: Motox166 on October 19, 2018, 07:39:48 am The cam and rockers (0n 108LC at least) is good for that RMP. Not too sure about the carbs and heads. If the heads were from JPM, I would not question it.. Change them out with 044 mini or regular wedge ports. GREAT head for the combo. My 2110 on old style wedge ports, 86C + 1,4 and 1 3/4 exhaust turned 200 hp at those RPMs. But on IDAs.. :) Yes, that does sound like a good idea. What compression are you at? Can you describe your power band? What rpm does it start pulling hard? 3500? John @ aircooled.net said about the L5 heads: "A test 2.0L engine with these heads made 186 HP with Dual 44 Webers. Web 86C and 10:1 compression. Cam pulls to 7500, but I recommend shifting at 7k" Title: Re: Hybrid Heads L5/L7 from Aircooled.net ??? Post by: Motox166 on October 19, 2018, 07:40:38 am Pics:
https://www.thesamba.com/vw/forum/viewtopic.php?t=708848 |