roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
I calculate 1.062" greater between centerlines. I plan to profile machine periphery of decks for a precision fit of head adapter plates. This "may" allow getting a stonger clamp package. Back to lifter valley stresses, even though we take the "tonage" of valve train stresses away, are there not substantial tensiles applied from combustion pressures? Possibly as high as 1,000 psi when plug lights? Spoke at length with," West Coast Racing Heads" today. "Richards" 2.3L.makes 270 hp at 7k and revs freely to 8,600. He took (1) lb. off of rod,pin,piston over stk. 907 parts.12/1 comp. on gas using ported 907 heads and 48 IDF webbers. Reportedly much better torque curve than stock S2000 engine.Lotus 912 heads have measurably larger ports std.vs 907. Reportedly, some motors are getting boosted to 40 psi-short term.They haven't worked on Volvo B234 head. roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907 vs Volvo B234,Rover V8 head swap
Just measured "Volvo". (2) center cyl's are fine, end ones aren't. End cyl's are 4.125" centers. Too much off-set to be viable. Perhaps it's fitting that a British head,(907/912), winds up, "Hot Rodded" onto a Brit. block. Would be good to hear from someone who has max-ported or cross-sectioned a "912".What if Lotus, tranverse bolt distance was enough to, "stud" outside of deck, into main girdle outboard and cam repacement plug on inboard?? I shall investigate. If so, Mega Boost? Ford raw forged crank? roverman.
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Lotus 907 vs Volvo B234,Rover V8 head swap
The 912 head looks very similar to the 907 head. What's the difference? It looks like you can't flip the cam cogs around...
I'm confused by the Main girdle stud idea. Are you saying locate the studs in a main girdle plate or something? Edited 1 time(s). Last edit at 11/17/2009 01:12PM by NixVegaGT. |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
Nic-all. 912 has bigger ports std. Cam towers should reverse like 907. No word if 912 will port further than 907. "If" bolt holes can be moved further apart-tranversly, this would possibly allow use of studs thru heads, external of Rover block, threaded into, wider than pan rail,main girdle and into thick-wall or solid alum. cam replacement plug on valley side. This could really tie-it-altogether for some serious power loads. If by "cogs", you mean belt pulleys? I believe their on center? Lets remember,driverside head is already forward(.842")= rod thickness. This helps getting belt #2 over there. So far, this looks like only heads to go with. Thanks for the intrest, roverman.
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Re: Lotus 907/Rover V8 head swap
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
FWIW, OS. int.@1.45",67grms.,3.3sq.in(both). OS. exh.1.282",60grms.,2.58sq.in.(both) Bucket 1.375" dia,52grms. I think when you crunch the math against 2 valve set-up, one might see some advantage.Even if 2 valve areas' were equal, 4 valve would likely out perform on street use,(port velocities/flow under the curve=torque ), with given stroke. Yes the impressive, Ford, D3 head flows BIG numbers, but in Nascar it runs 7K-9300 rpm? Were this head scaled-down to fit 3.7" bores, how would it stack-up? Let the Dyno sort it all out, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
Not much.Manton Engineering has Rockwell Tester , but only Diamond,("C" scale) tip). I will likely need ball,(brinell scale) for camshaft. What's your final thoughts on cam/lifter, blank-off? Should you decide to build a 4" bore, Bulbous Rotus Brossum, on Miracle Grow......? roverman
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Lotus 907/Rover V8 head swap
I think it may be necessary with the 4" bore to have better support through the cam journals. Is there a reason not to just weld the blank in instead of trying to do the cold fusion press-fit thing?
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
Nic and all, I see "sensible" amount of interferance fit as a good thing(.001-.002"). Preloading the valley area and then welding-even better. To install, merely freeze plug and preheat block(2 Walmart electric burners will do), drop in plug vertically and its in.I would also pre-heat prior to welding but keep the welding temp down, so you don't loose your press fit. Of course with a 4" bore, an integral deck plate will contribute strength while allowing favorable rod ratios with longer strokes, and possibly external studs?roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/ Lexus/Rover V8 head swap
Yes, if you read the "title"-Lexus ! According to "Pete Aardema" ,Lexus 4 valve head is SAME bore spacing. No, it doesn't just bolt on ! Infinity is SAME as sbc(4.4"). He is helping a friend for a waay serious Rover motor for Bonneville, (any head allowed). I suggested they "peep" us. I think "TA" should step-up, good promotion. I suggest a peep of Pete's webbsite. He does a lot of very impressive, top level engine mod's. He's listed in EB welding thread. 2010, I like it so far ! roverman.
Edited 2 time(s). Last edit at 01/04/2010 11:24PM by roverman. |
NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Lotus 907/ Lexus/Rover V8 head swap
OK. I'm not following. It does or doesn't have the 4.24" bore spacing? Are you saying he's putting the Lexus head on the Infinity block? There are a few guys putting that Lexus V8 into the first gen Celica. Maybe you could tap those guys.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
Lexus head,4.24 B.S. Infiniti head 4.4" B.S.
Edited 1 time(s). Last edit at 01/05/2010 06:48PM by roverman. |
NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Lotus 907/Rover V8 head swap
OMG!! AWESOME!
The VVT infrastructure can't hurt either. How common are these? Nevermind. I can do my own research. Thanks Art. Very cool. |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Lotus 907/Rover V8 head swap
Those heads will go on a Rover or SBB short block? That's pretty awesome.
Jim |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap
According to Pete Aardema, yes. Their considering for "Bonneville Rover" engine. The Lexus V8's seem to start around $900 complete. I would like to see them run a set of TA heads but it's, their deal. Have'nt heard flow potential on "worked", Toyota head. Unless one can regrind the stock cams for enough lift, looks real pricey. roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Lotus 907/Rover V8 head swap
Well then Grasshopper, your next task is to acquire a Lexus head gasket and see how the bolt holes and water passages line up.
Jim |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Lotus 907/Rover V8 head swap/Lexus ?
Uhh Nic... I think he's talkin to you ? I do like the big, "Hooters" on the front.Can I say that heer ?
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Lotus 907/Rover V8 head swap/Lexus ?
I'm already on it. LOL. Now that you mention the "hooters" we could vacuum form something more descriptive for corporate sponsorship… JK.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Lotus 907/Rover V8 head swap
Now there's a project worth pursuing. In fact, I have a homemade vacuum forming cabinet that I've never tried out. Might be just the thing. Wonder if we could get some heavy plastic sheet in the right color?
Jim |