cadebytiger
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| posted on 24/4/07 at 01:59 PM |
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rev limiter
hey all.
I want to know if i set a rev limit when i was setting up the ECU. i don't have the cable with me. Am i alright to just rev the thing up to when
i think the limiter should kick in with no load on. (i know this will be very loud)
i guess what i am asking is. Am i gonna blow it up or would it only blow up if it were under load
It's a pinto BTW
Rupert
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ned
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| posted on 24/4/07 at 02:10 PM |
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shouldn't blow up under no load - especially if it's what you plan to run to under load on the road  but itmight make you wince a little
beware, I've got yellow skin
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Guinness
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| posted on 24/4/07 at 02:12 PM |
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I wouldn't risk it to be honest.
In my humble opinion it doesn't matter if you have the engine under load or not if you over rev it!
The things that could go wrong aren't dependant on whether it's in gear or not.
Con rod giving way, piston hitting a valve, a valve breaking, piston hitting the spark plug. All possible with or without being under load.
Best to wait until you have the lead.
Mike
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cadebytiger
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| posted on 24/4/07 at 02:22 PM |
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will wait! There is no hurry
thanks
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dilley
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| posted on 24/4/07 at 03:42 PM |
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Labouring or over revving kills engines.
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TangoMan
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| posted on 24/4/07 at 05:26 PM |
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Most engine blow on overrun as the conrods stretch as the piston passes TDC as there is no compressed mixture to assist the momentum of the piston.
No load won't change that so don't risk it.
A pinto is a strong lump and will safely rev to 7K for short bursts and I can't believe you want to rev past that!!
Summer's here!!!!
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cadebytiger
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| posted on 24/4/07 at 08:21 PM |
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good god no!! lol
if i set it to anything i think it was about 5 or something. Think i was quite conservative.
i think i will check the box!! lol
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flak monkey
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| posted on 24/4/07 at 08:27 PM |
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What carbs are you running?
I have mine on twin 40s and it revs to about 6,800rpm, but its run out of puff at about 6,200rpm. Its pretty much self limiting.
What block do you have? If its not a 205, then limit it to 6,200rpm. If its a 205, limit it to 6,800-7000rpm.
I think they were revved to somthing like 5600 or so in the sierras/cortinas etc.
David
Sera
http://www.motosera.com
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cadebytiger
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| posted on 24/4/07 at 08:37 PM |
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it is a 205 block yes. right then might give it some more beans next time i find some straight road!!
Bloody loud at just 4500!!
ps-running 45s
[Edited on 24/4/07 by cadebytiger]
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flak monkey
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| posted on 24/4/07 at 08:42 PM |
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Hehe, my grandparents said they heard me coming back over their TV (which is pretty loud as they are half deaf) when i gave dad a blast down the road
last week.
You can hear mine when at home when i start it up round my grandparents (about 300 yards away).
Depending on the choke sizes you have, it will happily rev to over 7k with 45s, so would limit it to 6,800 to be on the safe side. Assuming the
engines in good nick that is! I rebuilt mine, so am happy that it will take it...
David
Sera
http://www.motosera.com
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cadebytiger
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| posted on 25/4/07 at 08:21 AM |
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we rebuilt ours too but did not use ARP bolts. I guess i should set it a bit lower than 6800 then?
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flak monkey
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| posted on 25/4/07 at 10:06 AM |
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Std internals are all good for over 7000rpm in short bursts with a 205 block, so 6,800 should be fine. Asked about ARP rod bolts when i rebuilt mine,
and was told it wasnt worth it. Only place thats got ARP bolts on mine is the flywheel.
Sera
http://www.motosera.com
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cadebytiger
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| posted on 25/4/07 at 10:11 AM |
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ye have heard the flywheel tends to be a problem. maybe we should have gone arp on that.
i guess this is less to do with rpm and more to do with studen changes in rpm.
We have a lightened on on there so maybe not so much of a problem
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flak monkey
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| posted on 25/4/07 at 10:14 AM |
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Yeah, the sudden changes are greater with a lightened flywheel too. (I have one on mine). Though not sure how the forces compare, as although the
changes are faster, there is less weight, so less inertia.
David
PS is that you in your Avatar with the firey poi?
Sera
http://www.motosera.com
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cadebytiger
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| posted on 25/4/07 at 10:16 AM |
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yes it is.
All fun and games until you get yourself in the face.
Thanks for the help. Sounds like a have the rev limit set too low (that is if i have set it at all)
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