Show us your Dyno Numbers
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Not been here in a while, a few updates and... Dyno numbers. First, my inline race engines, both 1380 MED bottom ends, one with standard though longer rods and out of the box Mini Spares alloy race head making 121+ at (rear) wheels. The most recent is a multiweb crank, Toyota rod bearings, with an MED 12G940 built to my specifications, running that wild twin Weber 45 MCHH pair of Show blke carbs I showed on my YouTube channel. That thing is unbelievable, making 135+ at wheels. That first engine was into it's second SEASON when the Bugeye was taken out by someone behind.
And my "Super 998"? Only the butt dyno so far, but it turned out better than I thought. I tested and improved it over a month or two. Oh yeah, I took video:
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At £20-25,000 per engine, the Swiftune AppK lumps are absolutely state of the art but do need refreshing every 10 hours or so of hard running. When you realise there were 32 of them plus probably half that again as spares for the Betty Richmond in April...
Chris Harris (off of Top Gear) buzzed two during the meeting.
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"Hang on a minute lads....I've got a great idea."
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Total posts: 1368
Last post: Jul 20, 2023 Member since:Jul 15, 2008
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Total posts: 5
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Can't find the printout right now, but the 998 in Betty did 60whp and 62 torques on a very accurate road with a 255 cam (essentially an SW5) which has now been upgraded to a 270 - should be a bit more in there.
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Can't find the printout right now, but the 998 in Betty did 60whp and 62 torques on a very accurate road with a 255 cam (essentially an SW5) which has now been upgraded to a 270 - should be a bit more in there.
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43whp at 4500 rpm. She was still making power but i didn't want to push her any harder
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Got it on the dyno with the old single 45 Weber on a port-matched Warneford manifold and baselined it at 91hp and was very pleased with that. Then put the splits on and made 90hp. Dyno time is expensive and I wanted to know what was up my new manifold so that went back on and we started learning. Over the next 90 minutes we made a bunch of jetting changes and finally figured out what the manifold wanted from the carb. I ended up making 89 with the new manifold just before bangdadangdadangdadingbadadadadadada the #1 piston cracked. Oh well, must have hurt it running too lean for too long. But that manifold showed promise, it accelerated the dyno load from 4500 to 7500 in 4th faster than the other setups.
edit ... forgot to mention this was on Peter Shadowen's dyno. All I did was sit in the car and try to put the throttle pedal through the floor, Peter did all the jetting changes.
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Add a good supercharger and back off on the compression (I was running 8:1) and you get an easy car to drive as well as one with LOTS of torque starting at low revs and lots of hp. The hard part is the "good supercharger" bit.
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That's BIG power. I was interested in supercharging my motor until I heard a couple of stories from fellows who were disappointed in the power gains they saw. The manufacturer claimed a 40+% increase in HP & torque. The consensus from these fellows was more like an 15-18% gain. Seemed like a lot of money for an additional 7 or 8 HP. Could'a been a tuning issue I suppose. Cheleker's numbers sound more like what I would expect.
I've been talking with a former Moss Motors employee at my local Cars & Coffee who, along with a "well known" parts manufacturer has developed a dedicated A-series blower that they claim produces big power without the usual reliability issues. He says it'll be on the market in a few months. Of course, he's been saying that since last August.
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And yes, the 850 is the kind of engine that almost can't hurt itself. Remember the Chrysler Slant Six? Many decades ago my brother and I used to frequent the junkyards in East Palo Alto. Back then wasn't too uncommon to drive a used-up car to the junkyard for beer money... those that knew the area then probably know what I mean This old fellow was trying to junk a late 60s Dodge Dart and found a yard that gave him 10 bucks! But he had to wait while they unloaded a truck of crushed cars. He was antsy for his beer so we gave him $9. Our auto-shop teacher loved the slant six! Used to say it was so bulletproof that you could put a brick on the gas pedal and it would just keep running. Here was our chance to try it, right outside the junkyard gate! We were sure it would either seize up dramatically, or (we hoped) blow up even more dramatically! We got it running, jammed the gas pedal and "looked busy" a short distance away under the hood of our GTO. We waited for the inevitable with baited breath. A few guys looked out the gate, as did some passers-by, but they just shrugged and went about their business. The 4-door Dart just made sort of a hissing sound at full throttle, among a slew of abandoned cars.
We were impressed- and disappointed! 15, 20 minutes went by, but finally..... it ran out of gas!! Later that day, we got the $10, and the yard-man poured some gas from a jar into the carb, and drove it in to it's grave.
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Found 39 Messages