3000M tarmac rally rebuild progress
Discussion
tvrmallorca said:
Call it inspiring ....never finished with improving a race car.....where did you get the wishbones from or did it yourself?
Top front and rears came with the car. Bottom rears are original modified. New lower fronts are being modified to take new arb, these came from D&G (not Dolce and Gabanna....)tvrmallorca said:
Call it inspiring ....never finished with improving a race car.....where did you get the wishbones from or did it yourself?
So true, I'm already @ rev-C some places. And for some strage reason is the hours spend at rev A and B not in the equation when planning rev C :-)Uhh and my new engine is in progress, pistons out and send for modifikation, heads will be flowed this week and cam followers is on the way from US (will need some tricky solution to make the shims float by magic between the stems and followers) and TTV will hopefully sonn be back from holiday and start on the 4 kg flywheel.
What valve gear, original or Rocker-Rollers? If it's the original you really don't want to go much past 5,500 anyway!!
But I suspect your limiting factors will either be fuel delivery (high pressure fuel pump??), and if you haven't got a suitably baffled tank, you are going to need one Road Rallying! or exhaust gas removal, the original TVR downpipes are quite restrictive, to get more bhp consider an exhaust system like GAjon has. I used to have one, and I reckon it was worth around 15bhp on a decently modified engine (won't help ground clearance though!!)
But I suspect your limiting factors will either be fuel delivery (high pressure fuel pump??), and if you haven't got a suitably baffled tank, you are going to need one Road Rallying! or exhaust gas removal, the original TVR downpipes are quite restrictive, to get more bhp consider an exhaust system like GAjon has. I used to have one, and I reckon it was worth around 15bhp on a decently modified engine (won't help ground clearance though!!)
tvrmallorca said:
finally got the engine in and dyno'd at 222bhp with a torque of 229.8 lbs rev band seams to be between 3200- 5500...before it all tails off and goes south again.
be interested to know anybody got other perfomance from the good old essex...I'm running a standard crank set-up
Paul, be interested to know anybody got other perfomance from the good old essex...I'm running a standard crank set-up
I have no Essex experience, but 74HP/liter seems rather mild, for a competition oriented motor, especially with a solid lifter cam. I would think, that if you're not going to do the weekly shopping, in it, or commute to work, that you would want to reach for closer to 100HP/liter. Are you worried about street driving, and being shaken, not stirred, at a traffic light? What are your
-compression ratio,
-bearing caps,
-cylinder head work (incl. valve sizes),
-cam profile?
What was your comment about the crankshaft related to? Are there forged steel units available? Do these engines appreciate main cap girdles? What rods are you using? Have you lightened the valve train? Are the pistons forged? Are they substantially lighter than the originals? Are the wrist pins? What fasteners are in the rods? Did your engine builder make the clearances loose, or more like a street engine?
It seems as though you might be underutilizing those carburetors, at that power level.
Best regards,
Bernard.
P.S. In all likelihood, asking here is not worth the time it takes to read the answers, (except for a handful, mine excluded), compared to calling
http://www.essexengines.com
or J.W. Developments,
or http://www.knightracingservices.co.uk/
or http://www.burtonpower.com/
and asking them.
P.P.S. Mostly me being nosy.
TVRMs said:
It's unlikely that you will get to the 100hp/tonne without spending quite a lot of money.
275-285 is very doable but the engine needs high compression, needs to be able to rev and that all important exhaust
This is very true, the exhaust really is key here, but in Tarmac Rallying, you are probably going to want something with more low down torque than an absolute screamer, the chances of being in the wrong gear for a corner are far higher than on a circuit, where the same thing is repeated every couple of miles. That said I can select a wrong gear anywhere!!!275-285 is very doable but the engine needs high compression, needs to be able to rev and that all important exhaust
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