macnab
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| posted on 8/1/07 at 10:21 AM |
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bonnet bump
I know folk have asked this before but its still a concern to me. I sat in the car last night with a cardboard bump over the bonnet to assess the
view. All I can see is a big bump and a big problem.
The options I see are
1) Raise seat - not happy with this as it affects the harness attachment height.
2) Lower front suspension - again not happy as the castor disappears.
3) Make smaller bump and leave filter off.
Hmm not sure about the SVA guy’s reaction to this, will he believe me that I'd run the car like this...
4) Lower engine - a no goer as it’s down as far as I can get it.
Any ideas? I notice that some cars have huge bumps but did they get through the SVA like that?
Sorry to be a bore and labour old subjects...
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macnab
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| posted on 8/1/07 at 10:25 AM |
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I pulled this pic off the archives, its not mine but the view is very similar...
Turned out a real nice car this
[Edited on 8/1/07 by macnab]
 
Rescued attachment BUMP.jpg
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Agriv8
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| posted on 8/1/07 at 10:56 AM |
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no filters and tights over Trumpets thus letting you have a smaller bumb ? but stopping major sh!te entering.
Oh and hope you have a tall examiner
OH & ps nice Bike !
Sma
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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macnab
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| posted on 8/1/07 at 11:02 AM |
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yeah I could do that though at best the bumps still 3 inches high.
Hate these farcical things about the test. They just seem to be padding it out to make more money
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David Jenkins
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| posted on 8/1/07 at 11:15 AM |
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I don't know - being able to see the road a reasonable distance in front of the car doesn't seem too unreasonable!
Are there any options for shortening the sump so the engine can go down lower? Or have you done that already?
cheers,
David
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macnab
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| posted on 8/1/07 at 11:24 AM |
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nope its not the sump but the bits sticking out the side of the engine that's stopping me lowering it. A real pest.
Wait till I fit the fuel injection system, then I really can't see a thing. Not surprisingly I am waiting till after the SVA to do that
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pewe
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| posted on 8/1/07 at 11:25 AM |
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With mine I've cut out a hole which the air filter pokes through. If SVA is a problem I'll have it tested without the filter and take some
mesh to cover the hole. Cheers, Pewe 
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David Jenkins
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| posted on 8/1/07 at 11:30 AM |
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Many people have left the air filter for a down-draft weber carb sticking out of the bonnet - that's acceptable as long as it doesn't have
any dodgy edges (foam ones are ideal). Could you do that? There's still a chance that it'll get in the way, but it'd certainly be
less bulky.
David
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Agriv8
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| posted on 8/1/07 at 11:42 AM |
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I think my bonet bulge is at leat 1.5 inches high at the front edge ( no problems at sva ).
But myself and my tester were not vertically challenged.
Personally dont like to see things sticking out of the bonnet but just to re-iteratie that a PERSONAL opinion. but the other side of this is that if
its your air filter least it should be pulling Cool air ( always an advantage )
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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iank
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| posted on 8/1/07 at 12:12 PM |
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quote:
Originally posted by Agriv8
no filters and tights over Trumpets thus letting you have a smaller bumb ? but stopping major sh!te entering.
Trying not to sound too harsh, but this is really poor advice.
Tights over the trumpets flow worse than a proper filter (foam or k&n) - as measured by Vizard, and let in all the dust/grit that destroys engines
after a few thousand miles.
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macnab
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| posted on 8/1/07 at 12:41 PM |
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Tights would probably do for the duration of the test, their ability to stand up to backfires I'm not certain. Maybe the foam idea, similar to
the BEC ones would work. That sounds a goer.
Funnily enough oh years ago I had cortina 1.6. I was going to change the engine over but in the mean time to help get some more power out I cut a hole
in the bonnet and binned the standard filter, basically not having one at all. I ran it like that for ages with friends telling me of all terrible
destruction I was causing too the engine, I even got stuck behind dusty quarry lorries. Eventually I took the engine to bits expecting to see a
laughable mess only to find not one little scratch! Amazing!
Not that I'm recommending leaving filters off but it was quite strange.
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Agriv8
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| posted on 8/1/07 at 12:51 PM |
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quote:
Originally posted by iank
quote:
Originally posted by Agriv8
no filters and tights over Trumpets thus letting you have a smaller bumb ? but stopping major sh!te entering.
Trying not to sound too harsh, but this is really poor advice.
Tights over the trumpets flow worse than a proper filter (foam or k&n) - as measured by Vizard, and let in all the dust/grit that destroys engines
after a few thousand miles.
totally agree - but for a keep the SVA man happy then sort it properly post mac certificat - Was not recomending this as long term soloution ( Should
have put that in my original post )
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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iank
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| posted on 8/1/07 at 01:23 PM |
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Splendid, glad we agree and all is clear.
About the bump, as said plenty of people have foam filters stuck out of the bonnet and pass SVA. Just need to be a little careful about sharp
edges.
Extreme lateral thinking, how about fitting a smaller engine for SVA, say a Crossflow 
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macnab
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| posted on 8/1/07 at 01:30 PM |
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Gah! the hassle
I'd need to make two sets of mounts and yet another exhaust system, pah. Not to mention changing the gearbox over aswell...
Maybe waving some notes in his face might work, hmm
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BenB
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| posted on 8/1/07 at 05:48 PM |
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What's the mahusive bonnet bulge for? Is it the engine or the carbs?? On the ST1100 the airbox and trumpets required a huge bonnet bulge- answer
was to whip off the Honda trumpets and chop down the airbox.... Still requires a little bulge but no a massive scoop...
You mention going EFi is going to make the bonnet bulge bigger? If you're doing a DIY EFi job surely that's a perfect time to make up an
inlet manifold that moves the carbs / TBs to the side / front of the engine rather than on top? Then again, you might be purchasing a ready-to-rock
setup e.g. Weber Alpha...
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MkIndy7
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| posted on 8/1/07 at 06:25 PM |
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Surely lowering the suspension would make no difference at all or v.v.little!.
Raising the seats would probably be a no no as well because of the angles between the seat belt mounting points and the base of the seat.
I think somebodys suggestion of goin for the Fuel Injection now might be the best... 2 long tubes running close to the profile of the V with short
headers to the ports and then a nice big Throttle body on the end of each tube!.
Would raising the rear of the engine/gearbox gain you anything by angeling the engine down at the front?
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macnab
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| posted on 9/1/07 at 09:15 AM |
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Lots of stuff there, cheers.
Where to start? Lowering the front of the car will reduce the castor as the car tilts forward, I believe I read there's just 1 deg of castor
normally. I lowered the front of a production car and the results on the handling were dire.
Tilting the engine unfortunately will not result in an improvement, but a good idea non-the less.
It was originally fitted with the old Bosch semi mechanical fuel injection, which features a huge box type chamber on top of the engine.
Now I'm not sure and I'll have to check but maybe the EFI system will fit this engine. That may be a solution.
Cheers for the advice
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