Lotus Elan

Motorway speeds

PostPost by: JonB » Sun Dec 17, 2017 10:17 am

Hi all

I commented on this before but a new thread is the best thing, I think.

My Plus 2 makes an odd noise at motorway speeds. It could be the gearbox, only I tried it in 4th and same noise. It's a kind of roaring sound, and so I wondered if it was just the wind blowing past the air intakes for the ventilation system. It starts at 60 mph and gets prominent 10 mph later. Really cannot tie it down to any location (such as the gearbox or diff), it sounds like it's coming from the front of the car.

Normal? Anyone else have it?

Cheers
JonB

PS, I can't try it out now - front suspension in pieces! Soon, soon...
Last edited by JonB on Mon Dec 18, 2017 9:49 am, edited 1 time in total.
1973 Elan Plus 2S 130/5 - UK - Chassis 50/1115L
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1095
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: prezoom » Sun Dec 17, 2017 5:39 pm

Try putting it in neutral when traveling at the speeds you indicated, to see if the noise goes a way.
Rob Walker
26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Tread softly in the grease mud, for there lurks the skid demon
prezoom
Fourth Gear
Fourth Gear
 
Posts: 989
Joined: 16 Mar 2009
Location: Escondido, California

PostPost by: john.p.clegg » Sun Dec 17, 2017 5:55 pm

I'm happy to say I can cruise all day at 85 , window down , elbow out and still chat to the wife with very little wind noise/buffeting , so good is the drag coefficient.

John :wink:
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5585
Joined: 21 Sep 2003
Location: Manchester

PostPost by: JonB » Sun Dec 17, 2017 6:25 pm

prezoom wrote:Try putting it in neutral when traveling at the speeds you indicated, to see if the noise goes a way.


I tried that, it didn't go away.
1973 Elan Plus 2S 130/5 - UK - Chassis 50/1115L
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1095
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: Spyder fan » Sun Dec 17, 2017 6:31 pm

Kindest regards

Alan Thomas
User avatar
Spyder fan
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2358
Joined: 11 Jun 2009
Location: Kent country & Sussex seaside UK

PostPost by: billwill » Mon Dec 18, 2017 12:38 pm

I dunno about you, but in the past I discovered that for my Elan the 70 mph speed is not the most 'comfortable'. It seems to be where the aerodynamic shape has lifted the front end and made the steering too light, but not the back end.

Whereas at 80-90 mph, the whole car has lifted and bullets in a very stable way through the air like an aeroplane.


PS: this was before the 70 mph limit was imposed on motorways, of course. :?
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4319
Joined: 19 Apr 2008
Location: London UK

PostPost by: denicholls2 » Mon Dec 18, 2017 4:51 pm

The neutral test appears to rule out the pinion gears as well because you're coasting rather than accelerating and one would expect a difference with worn gears. I'd say you're left with bearings (wheel or differential) and wind noise. My vote would be to find sources of wind noise, good candidates are the window seals. Bearings would change pitch over different speeds and tend more towards a growl than a roar.

Taping over the vents with masking tape would be a way to find a diffference. As noted, most Loti are rather aerodynamically slippery to begin with. Sunroof?
denicholls2
Third Gear
Third Gear
 
Posts: 490
Joined: 23 Jan 2006

PostPost by: saildrive2001 » Mon Dec 18, 2017 4:53 pm

I agree with you Bill, used to cruise at 90-95 mph & the car felt smoother & happier at that speed than running at 70mph.
Keith Marshall
69 S4 SE DHC RHD Original owner
saildrive2001
Third Gear
Third Gear
 
Posts: 450
Joined: 29 Oct 2003
Location: Ontario, Canada

PostPost by: JonB » Mon Dec 18, 2017 7:29 pm

Ok, I'll try that, good idea!
1973 Elan Plus 2S 130/5 - UK - Chassis 50/1115L
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1095
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: JonB » Fri Dec 22, 2017 10:08 pm

Um. Since finding a leak after washing the car, I begin to suspect the air box seal to the intake is compromised. Maybe this is the cause... has anyone got a picture of the heater box to bulkhead seal? Can't see it in the parts diagram.
1973 Elan Plus 2S 130/5 - UK - Chassis 50/1115L
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1095
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: The Veg » Fri Dec 22, 2017 10:25 pm

Not the best pic as the seal is still attached to the heater, but here ya go. It's just a foam ring, I think about a half inch thick and about an inch from inner diameter to outer. Mine was in good enough condition to wash and re-use. If yours is gone you could probably improvise with some foam weatherstrip.
Attachments
img_20160423_134126-x5.jpg and
1969/70 Elan Plus 2 (not S) 50/2036,
"It just wouldn't be a complete day if I didn't forget something!" -Me
User avatar
The Veg
Fourth Gear
Fourth Gear
 
Posts: 802
Joined: 16 Nov 2015
Location: Atlanta 'burbs (southeast USA)

PostPost by: vincereynard » Fri Dec 22, 2017 10:44 pm

Get it to the point of noise and drop the window.
vincereynard
Fourth Gear
Fourth Gear
 
Posts: 882
Joined: 12 Jan 2015
Location: amersham

PostPost by: JonB » Sat Dec 23, 2017 9:02 am

vincereynard wrote:Get it to the point of noise and drop the window.


Err.. why? I suppose if there is a change in pitch I can assume it's the airbox. Or maybe you're saying "drown it out"? :)
1973 Elan Plus 2S 130/5 - UK - Chassis 50/1115L
JonB
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1095
Joined: 14 Nov 2017
Location: South Coast, UK

PostPost by: vincereynard » Sat Dec 23, 2017 9:33 am

JonB wrote: Err.. why?


To pinpoint the possiblity of it being some sort of wind generated noise. You may be able to hear the source. Let the source be with you.

billwill wrote:Whereas at 80-90 mph, the whole car has lifted and bullets in a very stable way through the air like an aeroplane.


Has anyone experimented with a small bib spoiler and vents down the bonnet sides?
vincereynard
Fourth Gear
Fourth Gear
 
Posts: 882
Joined: 12 Jan 2015
Location: amersham

PostPost by: john.p.clegg » Sat Dec 23, 2017 11:10 am

like this...

splitter0012.jpg and



me , no difference

John :wink:
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5585
Joined: 21 Sep 2003
Location: Manchester
Next

Total Online:

Users browsing this forum: No registered users and 5 guests