Dyno guess, 340 W2?
#2168204
10/05/16 06:17 AM
10/05/16 06:17 AM
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Finalnd, Perkele
jyrki
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Fianlly got the trans of my 64 nostalgia Valiant sent to Liberty for some repairs and since the engine is sitting on the floor of my garage, I decided just for fun to take it to dyno tomorrow. Any guesses what will it make? The engine is as follows: 340 block, 4.07" bore 3.36" stroke steel crank Steel rods Mahle flat top pistons Solid roller cam, about 260 @ .050" and 0.65" advertised lift W2 heads, closed chamber, 2.02" 1.60", mildly homeported Victor W2 intake Holley 750 HP carb 2" open spacer MP race distributor 1 3/4" primary headers, 3" exhaust with mufflers. I believe it should make about 500 hp https://www.youtube.com/watch?v=wG5Lj4N1W1k
Plynouth VIP '67 TT IC EFI
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168259
10/05/16 10:57 AM
10/05/16 10:57 AM
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Joined: Jan 2003
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Portage,michigan
B3422W5
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Should make way more than 500. More like 550 if the heads are good.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168325
10/05/16 01:20 PM
10/05/16 01:20 PM
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Joined: Dec 2005
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Fulton County, PA
CMcAllister
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Mr. Helpful
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525 based on my experience with a basically identical piece. Never on a dyno but I know what it ran.
Last edited by CMcAllister; 10/05/16 01:23 PM.
If the results don't match the theory, change the theory.
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Re: Dyno guess, 340 W2?
[Re: CMcAllister]
#2168341
10/05/16 01:36 PM
10/05/16 01:36 PM
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PA.
pittsburghracer
"Little"John
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"Little"John
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When someone says mildly ported heads that's were the real guessing starts. A stock set of W2 heads flow 260 cfm @ .450 valve lift then go turbulent and start backing up. Slightly ported to some is addressing "THE PINCH" and that is not what is needed on a W2 head. Any person that ports heads has messed up his share of heads during the learning period and until you put hours of porting and flowbench testing do we learn from our mistakes. That is unless you have a skilled head porter looking over your shoulder which MOST of us didn't. If you just did a "buff and shine" you can go by the above number.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168344
10/05/16 01:39 PM
10/05/16 01:39 PM
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Joined: Jul 2004
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State of confusion
Thumperdart
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I`d run it as is but if you can get and 850 or bigger carb I bet more power would follow...........
Last edited by Thumperdart; 10/06/16 02:59 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168504
10/05/16 05:53 PM
10/05/16 05:53 PM
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jyrki
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Did not have the heads flowed, so really no idea. But just really made them bigger from areas that felt like compromises with the casting, the pushrod area and then some bowl work. I felt that since the engine is small, not to enlarge the port. This is not for max power in any sence, just for fun with the leaf springs and five speed with little or no maintenance. So far the engine has worked flawlessly. And fun it is, no matter what it produces!
Plynouth VIP '67 TT IC EFI
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168524
10/05/16 06:15 PM
10/05/16 06:15 PM
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Joined: Jan 2003
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Weddington, N.C.
Streetwize
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Open or closed chamber?
My only concern is that a 340 flat top won't provide a lot of compression, the rest of the combo looks great though.
I have the 'big brother' 440" W2 combo, basically 10:1 with a 251/259 @.050 street solid roller only, 2.08" intakes but only .605 lift, makes a LOT of torque and revs really quick.
Was 'Only' looking for 550/550...but it might make a tad more than that.
I can tell you that back in the early 80's we used to pull perfectly good 440 BIG BLOCKS out of B and E bodies and drop in Giant Killer W2 340's (along with 4.56-4.88 gears, lol) that were not much hotter then that.
Last edited by Streetwize; 10/05/16 06:21 PM.
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168548
10/05/16 06:54 PM
10/05/16 06:54 PM
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jyrki
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The heads are pretty odd, I bought them from the moparts for sale portion. They are closed chamber W2's, I remeber them being about 53cc, and they were brand new and untouched, but they still oil through the head. the rockers are old Harland Sharp. I feel the combo should be pretty good, the spacers under hte carb are hat I'm interested in, they are there completely for the looks, but we'll see what's the effect.
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168612
10/05/16 08:57 PM
10/05/16 08:57 PM
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So. Burlington, Vt.
fast68plymouth
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Like flow benches, the numbers from a dyno can vary greatly from one to another.
On our dyno my old 340 made 478hp with ported 587 heads(260cfm), victor, 850 carb, 262/265-108 solid cam, 11:1.
I would expect the w2 heads and roller cam to be worth 25-40hp or so(maybe more, depending on just how good the heads actually are.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Dyno guess, 340 W2?
[Re: fast68plymouth]
#2168837
10/06/16 09:29 AM
10/06/16 09:29 AM
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jyrki
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Back from the dyno. The engine worked like charm and exceeded even my wildest expectations.
First installing the engine, took about an hour, next warming up. The front needle was leaking, but fortunately had a new one with me. After warming up it was time for the first pull to 6500. The advance was 34 degrees and the pull started at 3500, was more than happy to see numbers starting with 5 in the screen. It made about 570 and was still rising, but a bit lean so we put in bigger jets.
Did nothing else than playing with the jets, and got 587 hp at 7000 and 677 nm at 5500, which is just shy from 500ft-lb. Usually a decent engine makes about 100nm per litre. this one made 118 nm per litre, which is very good! Didn't even pull the valve covers during the session. Had the engine just like it sat in the car, with the 2" open spacer. Tried finally also without it, and practically no change.
To put it into some kind of perspective, I built a sb chevy about a year ago, 400 block, 350 crank, around 380 cu in. it had ported Victor heads, the newest Victor SB intake, a swap cam with more degrees and lift etc, and it made less tq and power than this one did. The car weighs 2690 lbs, 9's should be possible with this engine.
Seems like I can't attach a pic of the dyno sheet anymore...
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168870
10/06/16 11:13 AM
10/06/16 11:13 AM
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CA.
RAY1969CARS
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Fianlly got the trans of my 64 nostalgia Valiant sent to Liberty for some repairs and since the engine is sitting on the floor of my garage, I decided just for fun to take it to dyno tomorrow. Any guesses what will it make? The engine is as follows: 340 block, 4.07" bore 3.36" stroke steel crank Steel rods Mahle flat top pistons Solid roller cam, about 260 @ .050" and 0.65" advertised lift W2 heads, closed chamber, 2.02" 1.60", mildly homeported Victor W2 intake Holley 750 HP carb 2" open spacer MP race distributor 1 3/4" primary headers, 3" exhaust with mufflers. I believe it should make about 500 hp https://www.youtube.com/watch?v=wG5Lj4N1W1k What motor was in it in the you tube hit
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2168985
10/06/16 03:01 PM
10/06/16 03:01 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
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I Live Here
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Back from the dyno. The engine worked like charm and exceeded even my wildest expectations.
First installing the engine, took about an hour, next warming up. The front needle was leaking, but fortunately had a new one with me. After warming up it was time for the first pull to 6500. The advance was 34 degrees and the pull started at 3500, was more than happy to see numbers starting with 5 in the screen. It made about 570 and was still rising, but a bit lean so we put in bigger jets.
Did nothing else than playing with the jets, and got 587 hp at 7000 and 677 nm at 5500, which is just shy from 500ft-lb. Usually a decent engine makes about 100nm per litre. this one made 118 nm per litre, which is very good! Didn't even pull the valve covers during the session. Had the engine just like it sat in the car, with the 2" open spacer. Tried finally also without it, and practically no change.
To put it into some kind of perspective, I built a sb chevy about a year ago, 400 block, 350 crank, around 380 cu in. it had ported Victor heads, the newest Victor SB intake, a swap cam with more degrees and lift etc, and it made less tq and power than this one did. The car weighs 2690 lbs, 9's should be possible with this engine.
Seems like I can't attach a pic of the dyno sheet anymore... NICE.................  I`d still looks at a bigger carb once you get some passes under your belt............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Dyno guess, 340 W2?
[Re: Thumperdart]
#2169009
10/06/16 03:25 PM
10/06/16 03:25 PM
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Joined: Jan 2003
Posts: 9,881
Weddington, N.C.
Streetwize
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Weddington, N.C.
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587 is very impressive, my old (like early 80's old) 69 340 Dart with w2's and 4 speed was a lot of fun, it had an Isky solid and big blocks used to duck me left and right. Motor used to switch pitch around 4800 rpm and I used to shift about 6800-7000.....no scattershield back then!  Awesome motor! Any pics of it in the car? Curious about your headers, those Early A fenderwells generally had pretty long tubes...not the best for high RPMs
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Re: Dyno guess, 340 W2?
[Re: jyrki]
#2169049
10/06/16 04:37 PM
10/06/16 04:37 PM
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Joined: Oct 2015
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UK
rb446
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mopar
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Some good numbers there....should run 137-8mph in 2690lbs sorted, I too would deffo go with a bigger carb after some laps, think your leaving some hp on the table...my old 340ci would gain 2/10ths down the 1/4 with an 850 over a 750.
Last edited by rb446; 10/06/16 04:38 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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