Red lining it...
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- Minor Addict
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Red lining it...
Out of interest folks, what's the red line point for a standard 1098 engine? And what do people think the red line should be for a rather tired 1098 engine with reasonable compression but about 230k on it?
Cheers:)
Nikki
Cheers:)
Nikki
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[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
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Well, the book says for a standard 1098, the maximum power is at 5100 RPM so it's pointless to go over that.
In practical terms I would not either, especially if you are unsure of the state of your big ends!
5000 RPM will give you a terminal speed in 4th of 81.5 MPH, so you really don't need to go faster than that.
As for revs changing up though the box, I always do it by ear and it depends on the engine and if I'm driving normally or not.
I guess I'd keep it under 4000, but basically rev until you feel happy with it (as long as it's under 5000!).
In practical terms I would not either, especially if you are unsure of the state of your big ends!
5000 RPM will give you a terminal speed in 4th of 81.5 MPH, so you really don't need to go faster than that.
As for revs changing up though the box, I always do it by ear and it depends on the engine and if I'm driving normally or not.
I guess I'd keep it under 4000, but basically rev until you feel happy with it (as long as it's under 5000!).
Well, it is useful to go a little over that, depending on gear ratios. You might find changing up the moment you hit peak power drops the revs outside the power band so much that holding onto the gear for a couple of hundred more would've been betterCam wrote:Well, the book says for a standard 1098, the maximum power is at 5100 RPM so it's pointless to go over that.
Seems some people are put off checking them - It's only a matter of dropping the sump and then whipping the caps off quickly! And at the price, might as well throw new shells on anyway if they haven't been done before.In practical terms I would not either, especially if you are unsure of the state of your big ends!
I've only ever broken one crank, and that was a 1098 A series. Although we did estimate it was doing twice the redline at this point, from the extensive damage I'd say as the 1098 is a long stroke torquey motor, it's probably better to use the low end grunt instead of hunt the red line, other than where gaps in the ratios make more revs more useful. As a rough guide, I'd agree much over 5k is just stressing things for little gain
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I used to take 5.5k as my redline on Rebecca, but as a real red line. The only time I went beyond it was experimental, and the valves started to bounce at about 6k, so...
Pyoor Kate
The Electric Minor Project
The Current Fleet:
1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
Desires:
Trabant 601, Tatra T603, Series II Landy, Moskvitch-401, Vincent HRD Black Shadow, Huge garage, Job in Washington State.
The Electric Minor Project
The Current Fleet:
1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
Desires:
Trabant 601, Tatra T603, Series II Landy, Moskvitch-401, Vincent HRD Black Shadow, Huge garage, Job in Washington State.
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- Minor Legend
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Mines a 1966 four door and it'll do 70 reliably but can trundle on to 80 without too much hassle (just lots of revs) provided there's no wind!
This is all relying on the accuracy of the standard speedo of course.
I really miss not having a tacho, I used to drive by them rather than the speddo.
This is all relying on the accuracy of the standard speedo of course.
I really miss not having a tacho, I used to drive by them rather than the speddo.
What would Macgyver do..?
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The factory limit takes 'normal' wind resistance into account, so the engine is not actually reaching maximum revs, just topping out on torque at 78 MPH. If you were going down hill with a wind behind you It's very possible to exceed the factory specified maximum. The 81.5 MPH figure is calculated from the engine RPM, gear ratios, standard wheel/tyre size etc, and corresponds to and engine speed of 5000 RPM.
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I've had Hebe (accidentally of course) 46% faster than perhaps she ought to have gone legally, but that was downhill. Of course, I'd never be so naughty to do it all the time.
Coincidentally, the reason for my question was:
at about 4,500 rpm Hebe's developed a rather large resonant rumble. Big end? (would tie in with the broken pully)... or perhaps something gone in the clutch (like a loose/broken thrust bearing)
Any ideas???
Nikki
(oh, and it happens in all gears and in neutral...)
Coincidentally, the reason for my question was:
at about 4,500 rpm Hebe's developed a rather large resonant rumble. Big end? (would tie in with the broken pully)... or perhaps something gone in the clutch (like a loose/broken thrust bearing)
Any ideas???
Nikki
(oh, and it happens in all gears and in neutral...)
<img src="http://www.aminorjourney.com/webcam.jpg" width="200">
[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
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- Minor Addict
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102 mph?!I've had Hebe (accidentally of course) 46% faster than perhaps she ought to have gone legally
blimey Nikki!
Pyoor Kate
The Electric Minor Project
The Current Fleet:
1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
Desires:
Trabant 601, Tatra T603, Series II Landy, Moskvitch-401, Vincent HRD Black Shadow, Huge garage, Job in Washington State.
The Electric Minor Project
The Current Fleet:
1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
Desires:
Trabant 601, Tatra T603, Series II Landy, Moskvitch-401, Vincent HRD Black Shadow, Huge garage, Job in Washington State.
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- Minor Addict
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Erm... No... Seee... I was never good at maths...
Let's see... that's supposed to be 88mph
Let's see... that's supposed to be 88mph
<img src="http://www.aminorjourney.com/webcam.jpg" width="200">
[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
[url=http://www.aminorjourney.co.uk/wordpress/]A Minor Journey[/url] A neogreen musician, her girlfriend and a cast of thousands!
Keep track of the restoration with the live webcam!
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- Minor Legend
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Erm... Cam? Since you've obviously got your maths head on, can you answer these questions?
1. What are the engine revs for a standard 1098 at 70mph
2. What are the engine revs for an Austin Metro with the 998cc A-series, also at 70mph?
I'm just interested... Ta ;)
1. What are the engine revs for a standard 1098 at 70mph
2. What are the engine revs for an Austin Metro with the 998cc A-series, also at 70mph?
I'm just interested... Ta ;)
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
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- Minor Legend
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Oh I see. I thought you might have a little magic book somewhere... Obviously not. I don't know the Metro gearing, or the diff ratio, presumed it would be the same as the 998cc Mini, but then it's a heavier car, so they could have fiddled with the gearing. Again, this was based on my erroneous assumption that you had a crib sheet. I see now you're doing it all by 'head.'
Anyhow, I just wonderd. So I'm looking at 4k at 70... not that Phyllis goes up that high usually... Ta.
Anyhow, I just wonderd. So I'm looking at 4k at 70... not that Phyllis goes up that high usually... Ta.
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
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does she ever get to 4.3K? If not I'll give her a run for you to burn off some of the carbon deposits ....So I'm looking at 4k at 70... not that Phyllis goes up that high usually...
Ray. MMOC#47368. Forum moderator.
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block