Post
by Woolfi » Mon Mar 19, 2018 11:15 am
"For yr V12E to win out on paper you would need to increase output to at least 260 kW (350 hp). Those Webers should come close, stock V12E’s are intake limited, 6 monster Webers should fix that."
From where do you know this ? Have you calculated , how bis a racing carb inner diameter shall be for one EV12 435 ccm cylinder ? A 1,75 inch stromberg is a big carb. I have calculated the gas speed in a 2 inch SU carb at 6000 rpm at 1005 cylinder filling. The gas speed in the carb is very low, is lower than in a racing carbs for a racing motor. I have red an books about rising the power, that in a correct calibrated racing carb, the gas speed shall by 50 m/sec. Now you can calcultae, how well a bif SU would fit to the EV12 motor.
The 4,2L six has much bigger cylinders (700 ccm) . Therefore this motor needs a bigger carb than the V12 motor with 435 ccm per cylinder.
One feature of Webers that you might find attractive, they have fuel pumps, same as yr Edelbrock, so when you stomp the accelerator the mixture by enriched by boosting the petrol, giving a noticeable “shove-in the-back”. Unlike CD carbs (SU’s or Strombergs) which richen the mixture by throttling the air, so there is no sudden thrust, just a gradual build-up."
From where d0 you know this ? Dreamed when looking at 6 polishes weber carbs ? Have you ever tested this with a real compare of two EV12 , one with Weber one with Stromberg ?
Mr. Bywater himself told a friend of me, that the 6 Weber with short induction in the V of the EV12 motor will have a very bad specific torque at low and middle revs.
I have 4 Stromberg carbs, well tuned with a taylor-made needle by checking the mixture with a Lambda measuring system , NOT (!!!) with a rolling road. With a rolling road and a gas tester you can't check the mixture just in time, when pressing the pedal. There is allways a delay, depending on the length of the rubber hose to the gas tester. When my car is rolling at 600 rpm in first gear at idle, and the temperature is below 15 degrees Celsius (cold street), and I press the pedal immediately to the metall, after 1/10 second my back wheels are spinning , producing gray smoke and now acceleration. Can you tell me where there is a lack of sudden "shove in the back" ? My car has a Getrag which is shorter in the first gear that the original EV12 4-gear box. Therefore I don't want to compare apples with peaches.
Also in second or third gear the sudden "shove in the back" at revs between 2000 and 3000 RPM is impressing in my opinion.
Shure I think, that a injection on a EV12 motor is better than 4 Stromberg carbs. Idle, gas consumption, smell of exhaust gases and max power. But also I think, that the torque of the original carbed EV12 motor between 2000 and 4000 rpm is higher that the torque of the injected EV12 motor. This was my experience in REALITY with two tests against injected EV12 , which had the same displacement like my car. The result was very stunning for me, because I thought before we have done the test , it would be different.
I hope to do a third acceleration test againts a injected EV12 with 6,0 l motor, make a small video, put to youtube and show the link here.
My cousin has a Ferrari Daytona. He is a racer and drives the car hard. I still hope to make an accelaration test against from 30 - 140 mph against his car and make a video.
A compare in fourth gear from 2000 to 4000 rpm is easy to do. Why ia a owner of an injected EV12 is not doing such a test against a (well tuned) carbed Ev12 ? Science and fun in one act. Then the smoke will clear and we will know the truth.
Regards Wolfgang Gatza
