wandr
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| posted on 20/8/19 at 08:42 PM |
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Iva falied again !
Iva retest at Northam today, last time failed on usual sharp edge stuff but engine wouldn't run properly at revs for noise test and speedo
check, changed fuel pump for retest and on try out at home held revs fine so thought I'd cracked it, sure enough held revs fine and passed noise
test, passed all other rechecks (edges etc) but when dropped in rollers for speedo check refused to pull under load and wouldn't go over 35 mph
and struggled to do that. Set up is twin 40 on cvh engine (1.6) with new webcon pump and lumenition ignition, not sure whether to set light to the
frusrtrating heap or give it one more try. The difficulty is trying it under load before the next test as examiner told I get one more go then its a
full retest !
Slightly good news was the speedo showed 35 mph and the examiners gadget showed 32 (acewell 3100 unit) so set up may be ok if it ever runs right not
sure what to check next, any suggestions ?
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snapper
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| posted on 21/8/19 at 05:50 AM |
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Take it to a rolling road and have it setup properly is now your only option. It’s got to be worth it and cheaper than a full Iva test
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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rusty nuts
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| posted on 21/8/19 at 06:34 AM |
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Have to agree with a rolling road set up , plus it will get the best performance out of the engine
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gaz_gaz
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| posted on 21/8/19 at 06:45 AM |
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as above get the car setup properly.
I failed in April at Northam. I chucked the car on the trailer and dragged it upto Dale at Bailey Performance. Dale worked his magic and the the end
result was a stress free pass at the retest.
It's a bit of a trek but well worth it in my opinion.
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CosKev3
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| posted on 21/8/19 at 08:11 AM |
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As above,needs a rolling road session.
It's quite a undersight IMO to not do it before a IVA anyway when you are running twin carbs etc
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coyoteboy
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| posted on 21/8/19 at 11:13 PM |
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It is hard to get a carby setup running right without a rolling road, or a deserted car park out of town if you don't want to throw the cash at
it. But you're building a car, you've already thrown cash at it 
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theduck
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| posted on 22/8/19 at 11:04 AM |
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I had a similar issue on my pinto at Iva, took it rolling road and fixed in minutes. Turned out the valve clearances were completely wrong and abusing
no other symptom than a lack of power.
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rusty nuts
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| posted on 22/8/19 at 04:14 PM |
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quote:
Originally posted by theduck
I had a similar issue on my pinto at Iva, took it rolling road and fixed in minutes. Turned out the valve clearances were completely wrong and abusing
no other symptom than a lack of power.
Ideally carbs are the last thing to adjust when tuning an engine, just goes to show how simple things have an effect. Unfortunately the CVH engine has
hydraulic tappets so is won’t be the cause in this case. If you haven’t already checked then check the valve and ignition timing as well as ignition
advance, and are you getting full throttle?
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