How long has your 5fa lasted?

MightyBoy tech questions and answers.
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fritz
Posts: 711
Joined: Fri Apr 16, 2004 11:21 am
Location: Perth WA

I was just marvelling the other day at how well my current f5a has faired since I've bought it.
It was a low km engine when it was installed, and since then it has done no less than 120,000 in two different mightyboys. The bottom end rattles a bit when she's got thin oil in herand she leaks a bit now, but other than that she's operated faultlessly since I've had it. It isn't even blowing any smoke yet. Quite amazing for such a small motor I think.

Anyone topped 200,000 with one of these? - it doesn't count if it's been pulled apart for reasons other than regular servicing.
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Trevor
Posts: 212
Joined: Tue Aug 08, 2006 11:11 am
Location: South West Rocks

Mines got 355000, but when I had it apart on the weekend the aluminium rear seal crank housing was painted making me think it.s been reco
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fritz
Posts: 711
Joined: Fri Apr 16, 2004 11:21 am
Location: Perth WA

I forgot to add that my MB had 115k on the clock when I bought it. The first engine was smoking and died from head probs at approx 125k.
I guess that's why I'm so impressed with this eng - the fact that it's lasted longer than the origional one did.
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me217
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Joined: Mon Jul 31, 2006 11:01 pm
Location: maryborough, qld
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wen i got my boy it had almost 200 on it. bout 199900 i think. i dont no if the engine been rebuilt or not but i knew the engine was dead. so in went a f8b.

me217
me217

1985 suzuki mighty boy : mods, f8b
1990 toyota mr2 gt import : mods, turbo timer, short shifter, 2.5" exhaust
1992 suzuki sierra : mods, g16b mpfi, 235's/75, snorkel & lift on the way.
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stevan_istheman
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Joined: Tue Nov 02, 2004 10:13 am
Location: Sunshine Coast, Queensland
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154563k's on the clock and still counting. :D
As far as i know my car still has the stock F5A from the factory too. :-o
Blowing a little smoke now but hopefully it'll hold out until the new engine goes in.
BAL4 Designs
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Almost a Mini
Posts: 96
Joined: Wed May 26, 2004 10:09 am

My old MB had 115,000 on it when we bought it (on original motor, verified from service history). We ran it up to about 140,000km. . .we then sold it to a friend and it's now done just under 190,000. . .on the original F5.
What's even better (or at least, more amazing) is that it's last 50,000km have been done with pretty much NO maintenence - same plugs and points and one oil change. No smoke, starts first go, doesn't rattle and gets driven about 80km daily, loaded down with crap, at 100km/h.
Maybe they're a reasonably tough engine after all!
Pete in Perth
1970 Citroen ID19B
1992 Suzuki Cappuccino
1966 Morris Mini Deluxe
1970 MkII Cooper S
1975 Mini Moke
1986 Suzuki Alto RS-X
1989 Nissan Pao
1989 Peugeot 205 GTi Mi16
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Brayden
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Joined: Sun Apr 11, 2004 3:09 am
Location: Canberra ACT
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My MB was bought with 120k on the clock and I took it to 150k before melting a hole in piston #1.
F8B EFI turbo - Three pots and a snail.
mowog
Posts: 970
Joined: Sun Apr 25, 2004 2:22 am

pete hope the timing belt has been serviced.
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fritz
Posts: 711
Joined: Fri Apr 16, 2004 11:21 am
Location: Perth WA

heh, interesting to find out that they can actually be tough little motors. :)
Mine cops a real hiding each and every day. Most of the time it is foot flat to the floor & high revs... :D

A mate of mine recently bought a vw (?) type camper in france and he reports it's first service is at 45,000km. No oil change or anything before then. :-o
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me217
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Joined: Mon Jul 31, 2006 11:01 pm
Location: maryborough, qld
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Mine cops a real hiding each and every day. Most of the time it is foot flat to the floor & high revs..
thats just to keep them moving isnt it :D
before melting a hole in piston #1.
thats nothin a bit of sticky tape will fix that :D


me217
me217

1985 suzuki mighty boy : mods, f8b
1990 toyota mr2 gt import : mods, turbo timer, short shifter, 2.5" exhaust
1992 suzuki sierra : mods, g16b mpfi, 235's/75, snorkel & lift on the way.
Almost a Mini
Posts: 96
Joined: Wed May 26, 2004 10:09 am

mowog wrote:pete hope the timing belt has been serviced.
Christ, no! Gawd, the new owner can hardly be bothered filling it up with fuel, let alone doing a timing belt!
It had been done just before we bought the car (100,000-ish) so I guess its due about now. . .be interesting to see if it goes pop, wont it? :)
Pete in Perth
1970 Citroen ID19B
1992 Suzuki Cappuccino
1966 Morris Mini Deluxe
1970 MkII Cooper S
1975 Mini Moke
1986 Suzuki Alto RS-X
1989 Nissan Pao
1989 Peugeot 205 GTi Mi16
mowog
Posts: 970
Joined: Sun Apr 25, 2004 2:22 am

As he coasts down greenmount trailing oil.....
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ToranaGuy
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Location: In the Shed!
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My mb has about 126k on the clock, got it at about 95k, it's not the original engine, it was an import and i don't really know how many kms on it, but my g/f left the oil cap off & starved the engine of oil, the conrod bearings are noisy & not great, but it could probably live another 15k kms or so.

As some of you know, i tried to source & still don't have bearings for it, 32mm journal size instead of 38ish, so i bought an f8b i'm in the middle of working on now. :D

I'm sure if i could get bearings, the little f5a would turn to more than 150k. It was blowing a little smoke when cold, but i think that's from the top end, not the rings. I'd rather a f8b in it anyways. :lol:

Cheers

ToranaGuy
It's update time MB Parts list! send part info to toranaguy74@optusnet.com.au|
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bigboy89
Posts: 75
Joined: Mon Jul 17, 2006 12:04 pm
Location: Mildura
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welll my MB has almost 60K on clock ive done bout 2k n it got the F8b when it had 50K so hopefully it will last alot more! :D
A pic of a girl on the bonett doesnt mean that my MB is a mighty girl!
gavmich123
Posts: 45
Joined: Sat Jan 13, 2007 7:56 pm
Location: BLACKTOWN

Ours has original 63,000kms same owner. I will be changing the oil in engine and auto and putting new oil fileter on engine. Not to sure if I should play with the plugs and carby just yet?
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