Backfire?
Moderator: Board Moderators
-
- Senior Poster
- Posts: 3720
- Joined: Tue Apr 04, 2006 21:28
- Model: Elite
- Colour: Monaco White
- Year: 1974
- Location: Nottingham
Re: Backfire?
Timing usually.
Pete
Pete
- rbgosling
- Senior Poster
- Posts: 1719
- Joined: Sun Jul 04, 2010 22:55
- Model: Lotus Excel SE
- Colour: Midnight Blue
- Year: 1990
- Location: Rugby
Re: Backfire?
Or possibly inlet valves that are worn/broken or not closing fully for some reason.
"Farmer" Richard
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
- bash
- Senior Poster
- Posts: 2222
- Joined: Thu Nov 03, 2005 15:34
- Model: Se, V8
- Colour: white
- Year: 1986
- Location: Doncaster
- Contact:
Re: Backfire?
Id go timing too, mixed up plug leads, distributor cap tracking or the infamous rotor arm.
Bash
Bash
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
- MetBlue
- Senior Poster
- Posts: 1422
- Joined: Sat Mar 24, 2018 21:00
- Model: Elite 74 & Excel 92 (SEish))
- Colour: Metalic Blue
- Year: 1974
- Location: Northampton
Re: Backfire?
Another cause is juvenile motorbike fun.
Drive down a straight road. Kill the ignition by the switch Japanese manufactures always thoughtfully put on the handlebar grip. A couple of good twists of the throttle. Switch ignition back on.
Now watch the people on the pavement jump as a satisfying 'bang' - and occasionally a flame exit the exhaust
Oh what memories.
Tony
Drive down a straight road. Kill the ignition by the switch Japanese manufactures always thoughtfully put on the handlebar grip. A couple of good twists of the throttle. Switch ignition back on.
Now watch the people on the pavement jump as a satisfying 'bang' - and occasionally a flame exit the exhaust
Oh what memories.
Tony
What goes together.... Must come apart.
- rbgosling
- Senior Poster
- Posts: 1719
- Joined: Sun Jul 04, 2010 22:55
- Model: Lotus Excel SE
- Colour: Midnight Blue
- Year: 1990
- Location: Rugby
Re: Backfire?
Ah - but that causes a backfire through the exhaust! Fill the exhaust with unburnt gasses, then ignite them.MetBlue wrote: ↑Mon Apr 18, 2022 12:33Another cause is juvenile motorbike fun.
Drive down a straight road. Kill the ignition by the switch Japanese manufactures always thoughtfully put on the handlebar grip. A couple of good twists of the throttle. Switch ignition back on.
Now watch the people on the pavement jump as a satisfying 'bang' - and occasionally a flame exit the exhaust
Oh what memories.
Tony
Another good way to get a backfire through the airbox is to convert to LPG. I had an LPG-converted Subaru that used to do that randomly, scared the bejeezus out of me the first few times.
"Farmer" Richard
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
- Hawaiis0
- Senior Poster
- Posts: 4146
- Joined: Sun Jun 30, 2013 18:39
- Model: Excel SA (No 3); Elite 504
- Colour: BRG; Dirty White
- Year: 1986
- Location: West Oxfordshire
Re: Backfire?
I now believe the correct term is SPITTING.
I will go with timing and associated parts first.
Thanks
I will go with timing and associated parts first.
Thanks
Nothing is fool proof. Fools are clever!
-
- Regular Poster
- Posts: 130
- Joined: Tue Aug 10, 2021 20:38
- Model: excel
- Colour: red
- Year: 1985
- Location: NL
- Contact:
Re: Backfire?
Lean mixture will burn so slow it is still burning when the intake valve opens again. This works best with a fuel injected engine with a large plenum, but you can also melt a nice pair off double barreled Solexes