Paul Y
Posted a lot
Posts: 1,951
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I had similar problems with high under bonnet temperatures and fuel boiling up with the big block in my 56. The problem, as others have said, is that the hot air cant get out at low speed/in traffic due to the bigger (physical) engine, exhausts etc taking up the route the air would normally exit through So, curing it was a bit of trial and error but solved it eventually by using a pair of Spal fans and programmable controller, fan shroud and louvres in the inner wings. Fans programmed so that one came on at around 185 with the second kicking in at 200. In traffic it would pull the temp down to 180 from 200 in under a minute, the heat wash was unbelievable! On the move it was a constant 180 with the fans not kicking in at all. I would try a number of louvres in the wings (inner) a good shroud and a pair of electric fans, seems like it is an air management issue rather than an overheating engine Love the build, look forward to seeing how it develops. P.  |
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moomin
Part of things
Posts: 772
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Nov 30, 2014 16:29:36 GMT
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Stripped both sets of carbs and checked the float valves. All fine, but upon reinstalling and pressurising the fuel one started to pour fuel out the overflow! Tap with a spanner and it stopped. Float valve must be sticking under pressure time to buy some more. Then I turned my attention to the problem of a ridiculously hot engine bay. Moved the 12" radiator fan over so it's inline with the middle of the block. Time for some cold air feeds...  Flipped the wing vent and capped it. Looked curse word when it was finished so I binned it. Need something better, but I'm all out of sheet steel. Or so I thought, one less shelf to store junk on.  Cut that up with some tin snips...  Bend it a bit...  And Boom! Airscoop for free  Rivets...    Repeat the process  Having read everyone's suggestions again I'm going to turn them round to form exits. Look a tad mental as intakes! Thinking that I could make some big air scoops below the from edge of the wings then force the air into the engine bay by the carbs. |
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Last Edit: Nov 30, 2014 16:33:25 GMT by moomin
@toxicknobs
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Nov 30, 2014 19:51:00 GMT
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I think the vents you've now made - won't achieve very much. All the air will simply escape via the wheelarch, making these rather redundant. Would look pretty cool once spun backwards however Potentially, add some fans to the inner-wings (if you've still even got them??) to suck air out from around the engine, to the wheelarches. Simply have them activate with a radiator switch for ease of control, without just having them on all the time. Shame I'm not closer - would've happily lent a hand to sort out the issues you've encountered  |
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You're like a crazy backyard genius! |
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Nov 30, 2014 20:17:33 GMT
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Rather than add on why not cut the vents in when you reverse them? far more stealth
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retired with too many projects!
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orangecords
Part of things
yawner extraordinaire
Posts: 892
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Nov 30, 2014 20:20:44 GMT
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Rather than add on why not cut the vents in when you reverse them? far more stealth ^^^ what he said ^^^ |
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I then wanted to start cleaning the interior as it stinks of wood (the material not the smell of a boner) best quote ever! |
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moomin
Part of things
Posts: 772
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Nov 30, 2014 20:20:57 GMT
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I think the vents you've now made - won't achieve very much. All the air will simply escape via the wheelarch, making these rather redundant. Would look pretty cool once spun backwards however Potentially, add some fans to the inner-wings (if you've still even got them??) to suck air out from around the engine, to the wheelarches. Simply have them activate with a radiator switch for ease of control, without just having them on all the time. Shame I'm not closer - would've happily lent a hand to sort out the issues you've encountered The ducts are above the footwells and inner arches. The wheel arches are almost completely sealed off, bar some drill holes, from the engine bay. I guess to stop spray and mud getting in there when off roading. Inner wings are intact but covered with bits and pieces. Huge fans might be the way forward. But should they... 1) draw cold air in allowing hot air to find a way out on its own OR 2) extract hot air out allowing cold air to find a way in??? |
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@toxicknobs
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moomin
Part of things
Posts: 772
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Nov 30, 2014 20:21:56 GMT
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Rather than add on why not cut the vents in when you reverse them? far more stealth ^^^ what he said ^^^ Yes, this is a plan. 10 Internet points. |
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@toxicknobs
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Nov 30, 2014 21:07:02 GMT
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2) extract hot air out allowing cold air to find a way in??? Fans work better sucking, than blowing  |
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You're like a crazy backyard genius!
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moomin
Part of things
Posts: 772
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Nov 30, 2014 21:15:37 GMT
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2) extract hot air out allowing cold air to find a way in??? Fans work better sucking, than blowing Oh my! It's enough of a problem for Land Rovers that Pacet make a rather hideous solution... www.pacet.co.uk/bonnetfans.php |
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@toxicknobs
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Nov 30, 2014 21:46:51 GMT
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oh my word that is hideous....
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You're like a crazy backyard genius!
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Nov 30, 2014 22:25:01 GMT
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Hahaha. That looks like a giant whirlybird that goes on top of a ute canopy. I think the vents would look and work better if they were flush with the wing and the scoop part was inside scooping air out. From what I know of air pressure, the air rolling along the wing will help pull the hot air out anyway if there's enough pressure inside the engine bay, which would be provided by the additional fans pushing air in from the front. I think this is what supaimpy said, anyway. Probably less likely to carve chunks out of pedestrians with old shelving, too.  |
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Nov 30, 2014 22:26:31 GMT
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Just an idea, with the holes in the guards, what about wiring up some computer case fans on a switch, so they can exhaust the air when not moving?
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Nov 30, 2014 22:50:46 GMT
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A couple of ideas I have for mine are slightly raising the bonnet so there's a clear gap all round to the wings to let air out, and make the spare wheel carrier in the centre into another air outlet.
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Nov 30, 2014 22:55:19 GMT
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vote heat shield between manifolds
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Last Edit: Nov 30, 2014 22:57:23 GMT by darrenh
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***GARAGE CURRENTLY EMPTY***
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moomin
Part of things
Posts: 772
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104 miles round trip at 10mpg. About £50. Maybe. In the mean time been working on the windows and door tops as my dad keeps moaning he's cold in his!  Frames are better colour match to the roof in grey primer. Just awaiting some nylon bolts before I seal them up.  Snap vents are cool, can open angled or straight. In the summer I won't bother with the tops at all. |
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@toxicknobs
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G'day moomin. having built a few cars over the years. In the 70's over here in OZ the fashion was to lift the back of the bonnet can I suggest you get rid of the rear bonnet hinges & in their place set up a set of lock pins with a spacer on them to lift the rear of the bonnet by at least 2inches this may not look to good on a custom car but on the rover it will look ok. we used to do this a lot on cars with multiple carburettors. this will release a lot of heat at idle. but killer if you open the screen vents
ernie
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Chrome and detail the engine bay, and remove bonnet |
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Some big engined beetles have stand off hinges on the engine cover, presume thats a possible solution ?
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1994 Mercedes e220 petrol estate, daily driver.
1998 Peugeot 406 Coupe 3.0 v6, shopping car.
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moomin
Part of things
Posts: 772
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G'day moomin. having built a few cars over the years. In the 70's over here in OZ the fashion was to lift the back of the bonnet can I suggest you get rid of the rear bonnet hinges & in their place set up a set of lock pins with a spacer on them to lift the rear of the bonnet by at least 2inches this may not look to good on a custom car but on the rover it will look ok. we used to do this a lot on cars with multiple carburettors. this will release a lot of heat at idle. but killer if you open the screen vents ernie Minor difference between the two countries is of course the climate. It's hard enough to start in the damp, with a bonnet that let's in the beautiful British rain it'll be impossible to fire for 11.5 months of the year! Big fans in the wings is the plan as it's only a when stationary issue. Think I can get a 10" fan in each inner wing. |
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@toxicknobs
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