3000M tarmac rally rebuild progress

3000M tarmac rally rebuild progress

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Discussion

anonymous-user

53 months

Wednesday 21st January 2015
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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....)smile

madsvlund

345 posts

131 months

Wednesday 21st January 2015
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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.


tvrmallorca

Original Poster:

265 posts

137 months

Thursday 22nd January 2015
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My new led lights

magpies

5,129 posts

181 months

Thursday 22nd January 2015
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those look more aerodynamic than mine


GTRene

16,369 posts

223 months

Friday 23rd January 2015
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magpies said:
those look more aerodynamic than mine

looks almost like a set of lights from a Fors RS200


magpies

5,129 posts

181 months

Friday 23rd January 2015
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I built this replica....280 bhp 4WD 1240kg


GTRene

16,369 posts

223 months

Friday 23rd January 2015
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ah, that explains it biggrin

Slow M

2,726 posts

205 months

Friday 23rd January 2015
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magpies said:
I built this replica....280 bhp 4WD 1240kg

I LOVE THAT!!! What differentiated it, from an original?
(Sorry about the thread hijack.)

Best regards,
Bernard.

magpies

5,129 posts

181 months

Friday 23rd January 2015
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SlowM

I've PM'd you the answer as I don't want to hijack this thread

biggrin

tvrmallorca

Original Poster:

265 posts

137 months

Wednesday 28th January 2015
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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

DavidY

4,458 posts

283 months

Wednesday 28th January 2015
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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!!)

tvrmallorca

Original Poster:

265 posts

137 months

Wednesday 28th January 2015
quotequote all
i have a baffled sump, uprated head and definitely high pressure pump. pistons have been uprated. and have been advised not to exceed 6500revs however we will set the reve limiter to a 6200 since the top end is not really required and the HP drops off at high revs.

Slow M

2,726 posts

205 months

Thursday 29th January 2015
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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,

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.

magpies

5,129 posts

181 months

Thursday 29th January 2015
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to sort out your rev limit, work out where your peak torque is and at what revs to go to in the lower gear to drop into the next gear at peak torque. You may find that you don't have to rev beyond 5500 if peak is 4000.

Edited by magpies on Thursday 29th January 23:05

tvrmallorca

Original Poster:

265 posts

137 months

Thursday 29th January 2015
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magpies...thats a great help :-)

anonymous-user

53 months

Friday 30th January 2015
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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 exhaustsmile

DavidY

4,458 posts

283 months

Friday 30th January 2015
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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 exhaustsmile
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!!!

tvrmallorca

Original Poster:

265 posts

137 months

Saturday 31st January 2015
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The decision is to go for 1 7/8" for the primaries and 2.5" for the single pipe. The exhaust will be stainless lazer cut and then routed so we keep good ground clearamce. Probably just one silencer rather than two. I heard stories that 2" is ok for the pipe?

DavidY

4,458 posts

283 months

Saturday 31st January 2015
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Tuned Lengths???

madsvlund

345 posts

131 months

Saturday 31st January 2015
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From the calculations on my engine (3.0 Jaguar) did I end up with 1,5" primary tybes 1,5" dia -30" long, and 2x2.25" (could be 2x2" without problem)

All parts sourced from MIJ exhaust