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rick m
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« on: July 16, 2012, 05:29:52 am » |
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Just finished up reshaping the combustion chambers on my 2275 heads and doing a new valve job. Ran this combo before on one of my motors and could consistently run pump gas and keep engine temps where I wanted them...Will be assembling the motor this week.
Rick M
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« Last Edit: September 22, 2012, 17:28:57 pm by rick m »
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Rick Mortensen
Driving Hot VWs since 1970
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Zach Gomulka
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« Reply #1 on: July 16, 2012, 06:02:21 am » |
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Those are some big chambers  |
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Born in the '80s, stuck in the '70s.
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rick m
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« Reply #2 on: July 16, 2012, 06:39:16 am » |
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Yes they are....but with the piston combo and deck setting...work well.
RM
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Rick Mortensen
Driving Hot VWs since 1970
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Joel Mohr
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« Reply #3 on: July 16, 2012, 17:11:22 pm » |
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Beautiful! Those look exactly like my street car heads,(but I've got 46x36 valves) I'm running 11.2 to 1 without any problems at all...2442, cam is a special grind, .650 x 310*... makes 215 with the belt on through the muffler...
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SEE YA AT THE RACES!!!
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rick m
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« Reply #4 on: July 16, 2012, 19:17:57 pm » |
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Johl.....Unless everyone realizes it is the piston design, deck and chamber combo...they freak when they see these type chambers. They definitely work.
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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Taylor
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« Reply #5 on: July 16, 2012, 21:11:55 pm » |
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How much compression dies thus motor have?
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rick m
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« Reply #6 on: July 17, 2012, 01:05:55 am » |
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Johl...I have 42mm x 37.5 valves in these heads.
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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jamiep_jamiep
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« Reply #7 on: July 17, 2012, 08:58:51 am » |
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What pistons do you run Rick? I know the sum total of zero about piston specs and would love top learn more.
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Taylor
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« Reply #8 on: July 17, 2012, 09:14:07 am » |
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Its a secret! Maybe they are super squishys, or Keith black 426 hemi pistons? Whatever they are. They must be domed
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Joel Mohr
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« Reply #9 on: July 17, 2012, 16:57:54 pm » |
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Mine are Weisco flat tops with valve pockets....nothing special!
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andy198712
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« Reply #10 on: July 18, 2012, 10:07:41 am » |
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looks kinda like a semi hemi, are you running zero or even positive deck then? or SS..... interesting!
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rick m
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« Reply #11 on: July 18, 2012, 14:55:44 pm » |
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Definitely running zero deck...with a copper gasket
RM
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Rick Mortensen
Driving Hot VWs since 1970
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Joel Mohr
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« Reply #12 on: July 18, 2012, 18:39:31 pm » |
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We based mine on the Semi-Hemi, then Clyde did his magic. A bigger intake would definitely make a difference....
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Donny B.
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« Reply #13 on: July 18, 2012, 23:05:59 pm » |
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They look very similar to the ones on my engine that were done many years ago at the Bergs. I have run Berg semi-hemi heads on all my performance street motors. Gee they seem to work too...
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Don Bulitta
Wolfsburg Registry
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rick m
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« Reply #14 on: July 19, 2012, 08:14:32 am » |
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YES THEY DO. When I drove your motor Don I made up my mind to take my heads off and do it! Plus our discussion with Gary Berg at BUG-IN sinched the deal!
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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Torben Alstrup
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« Reply #15 on: July 19, 2012, 12:51:37 pm » |
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Wellll, if the alternative is a conventional head along with lots of deck height, I think I will take the SH heads too.  They sure look smooth. T |
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fish
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« Reply #16 on: July 19, 2012, 13:09:15 pm » |
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hi Rick, it just goes to show that some semi heads do work even when a lot of people may disagree.
I got some type 4 SH heads with 105mm flat tops that I can't wait to run.
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Had a fight with a Magneto, it won!
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Zach Gomulka
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« Reply #17 on: July 19, 2012, 13:19:34 pm » |
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How many CC's are in those? Whats your target compression?
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Born in the '80s, stuck in the '70s.
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K-Roc
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« Reply #18 on: July 20, 2012, 23:29:06 pm » |
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With a Flat top piston I can't see getting much compression out of it unless the chamber is really smaller than it looks in the picture, Also a lot of timing advance needed as well. That chamber would love twin plugs ! |
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Zach Gomulka
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« Reply #19 on: July 21, 2012, 04:48:53 am » |
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With a Flat top piston I can't see getting much compression out of it unless the chamber is really smaller than it looks in the picture, Also a lot of timing advance needed as well. That engine would love more compression! Fixed it  |
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Born in the '80s, stuck in the '70s.
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nicolas
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« Reply #20 on: July 21, 2012, 10:29:58 am » |
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How many CC's are in those? Whats your target compression?
yes i want t know as well what CR you are aiming at, as the semi hemi heads that berg sold were set up for very low CR. what is the difference between these and semi hemi's anyway. |
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rick m
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« Reply #21 on: July 21, 2012, 16:56:22 pm » |
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These heads are heavily worked over by hand to remove all sharp edges and machined cuts. Valves are also unshrouded (alot). Will give a report on performance when the motor is back in. There are a lot of different combos. One motor I held a tight chamber and put a large step in the pistons. I like trying new combos.
RM
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Rick Mortensen
Driving Hot VWs since 1970
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Joel Mohr
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« Reply #22 on: July 21, 2012, 17:30:21 pm » |
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DYNO IT!!! It's so funny that the majority of the nay-sayers have done little if ANY dyno work...I've been using this chamber design for over 12 years, and have built many, many motors with just the hemi cut, and I can tell you without any reservation that Gene had little idea what he uncovered. In my work with Semi-Hemi heads, Gene was using TOO LOW of compression ratios, and THAT is what makes them hard to tune. Without the "squish area" the fuel can ONLY be fired by the plug. With todays gas, spark control is the best way to control flame travel and combustion. "Deseilizing", or squishing the fuel only leads to hot spots and "accidental" firing. Hence, PING! With the Hemi chambers, I have seen MUCH more even burn patterns, and much more power with the same combos...OK, I'm done...
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bilboa2
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« Reply #23 on: July 22, 2012, 00:38:56 am » |
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my heads on joel mohr built 2386, 48 idf motor for my baja, 44 x 37 heads also "adjusted" by clyde. runs very strong. bill
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rick m
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« Reply #24 on: July 22, 2012, 03:04:16 am » |
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Johl,.....It is funny that I lost my way when building my recent motor. I had already also discovered the benefits and drivability of the hemi style chambers. I got fed up with how my motor was performing and took my motor down, redid my heads and now I know I will like it more. I ran the combo in my last little driver motor...94x69 (1915). Had 40mm Weber IDFs. I got as high as 33mpg with that motor with a 110 cam.
These heads work.
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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rick m
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« Reply #25 on: July 22, 2012, 03:05:25 am » |
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Bill...forgot to ask you what you are running for a cam and what you have your timing set at.
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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Zach Gomulka
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« Reply #26 on: July 22, 2012, 03:35:40 am » |
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I got fed up with how my motor was performing...
Please explain, how was it performing? |
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Born in the '80s, stuck in the '70s.
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ibg
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« Reply #27 on: July 22, 2012, 04:28:16 am » |
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I have a slightly different version like semi hemi with a little flycut, so there is a bit of squish around the edge. 43thou deck, 9.4:1 comp on 98 ron petrol, 86B cam. Best power at 28 deg total timing which is quite different to traditional semi hemi thinking. makes 110 kw to the Rear Wheels. Runs good head temps with SE heads. I like it  Sorry no pics. |
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bilboa2
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« Reply #28 on: July 22, 2012, 07:05:45 am » |
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rick, cam is a webcam joel picked. 290 x 505, 1.1 berg rocker, shafts, 262 @.050. compression is 9.7, I am at 5k elevation. Don't have later dyno sheets from ken tabers ( 5k elevation) but I seem to remember 24 lbs at 2500 rpm, Still has bottom end, found joel's dyno sheet from his place,(2500 elev.?) prior to kens dyno and joel's corrected hp was 190 @ 6k with 191.5 trq at 4500 rpm with a somewhat restricted exhaust , motor then brought north, rejetted, and a doug berg made new free'r exh. system. Live up here in northern nevada, carson valley/lake tahoe, thin air, and gets hot in the summer. No pinging or overheating. Thanks Joel. Sorry, can't remember timing.. bill
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rick m
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« Reply #29 on: July 22, 2012, 07:21:50 am » |
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Crank is in the crank stand and ready for rods....Back to assembling....Also creating a second deck lid for the chop for the summer. I had a spare 67 deck lid that needed a little fixing... Straightened the dings...prepped a convertible set of louvers (actually later bug that had the same louvers as a convert) and will finish the spare decklid when I have the chop up and running.
Rick M
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Rick Mortensen
Driving Hot VWs since 1970
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