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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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10-03-21, 10:23 PM
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David 
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10-03-21, 10:23 PM
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David
The summit carbie you have does seem very tall and Kevin is right the air cleaner sits very high . My 411 Mk2 (high compression motor ) had a 750 holley on it and performed very poorly and used a lot of fuel. A friend of my brother Geoff who would likely be Australia's authority on all things Mopar strongly recommended going back to an original Carter (Edelbrock) 650 cfm carbie. I took his advice and it transformed the general running of the motor ( very pleased). Since then Edelbrock have released a new series the AVS2.They come in avariety of sizes and finishes, I plan to fit a 1906 to my 412 shortly. You motor is smaller than mine but is warmed over therefore a 650 cfm like my new one would be ideal . Check the website for dimensions ( the video is worth a watch). One danger if you change carbies make sure you set the auto transmission kick down correctly or you will burn out thr transmission. Your correct, the point of first contact with the air cleaner is at the front because the bonnet slopes down.
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10-03-21, 10:31 PM
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Thanks, Peter. Whilst the Edelbrock 1906 may well improve the drivability, it seems it is 3.25" high same as the Summit one currently fitted. I am going to focus for now on getting a quieter, more stock looking air cleaner on there somehow but will bear the carb change in mind for future.
My US born and bred neighbour who likes loud cars and motorcycles suggested I cut the 'hood and fit a shaker intake'. Heaven forbid! David
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11-03-21, 06:21 AM
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What a great idea you would be the first Bristol owner to do so. Could I suggest a supercharger and 20 inch wide rear wheels.
Interesting the Edelbrock is the same hight , the summit in the photos looks much higher. Shall leave you in peace Best of luck
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11-03-21, 09:31 AM
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I hate to say it David - but same thought occurred to me about the shaker hood scoop! I did dismiss it though! Hope the air filter box solution works other wise I guess you have to start looking at low rise manifolds shallower carbs and so on. Bet the car goes well with the 360 and hotter cam though.
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11-03-21, 10:40 AM
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Quote:
David
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11-03-21, 10:43 AM
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 What a horrible thought!I have ordered a 14" pancake air cleaner (the filter is exposed around the whole circumference) with a recessed bas to lower its overall height. I'll see how that does for fit and a first step towards quietening. I'll report back when fitted. David
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11-03-21, 10:08 PM
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Re setting the kick down lever I have no understanding of how to, I paid the guys who rebuilt my auto to do it. There is some infomation on the Web but I dont fully understand it. Just be warned
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12-03-21, 11:27 AM
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Sorry about the late reply. My air cleaner is 17" diameter (underside it's a little wider at the top). The hole for the carby is 5". My carb is an Edelbrock (1812) 800 CFM AVS Thunder (manual choke, which is not used). However, my engine is a B block, so possibly a little wider in the valley than the small block 360. As stated previously, the air cleaner is 90mm high, although the bottom is recessed, so the effective height off the top of the carb is 81mm. So 81mm higher than the flange around the top of the carb. Unfortunately I can't say how the bonnet of the 411 compares with the 408. Kevin
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12-03-21, 11:31 AM
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Thanks, Kevin. It helps me zero in on what might fit although lots of mocking up and test fitting seems to be in my future. I'll keep this thread posted as ( or if ) I make progress.
David
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18-03-21, 03:56 PM
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I have fitted the 14" round air cleaner. It has a deep (~1") recess in the underside. I put 3/8" thick expanded polystyrene blocks on the forward edge and the top nut to see if closing the bonnet left any indentations. I didn't see any, so I tried to film the inside of the bonnet when closed to see how much clearance there was. The video is here: https://youtu.be/oX2-ctVTgs4 The film of the front edge is quite clear but the film trying to see the top nut didn't work as I couldn't get enough light on the place. Still, I am quite pleased with the fit. Now I need to go a drive to see if it's any quieter.
If I need more, the next step is to buy a used snorkel/silenced air cleaner and, if necessary, cut out its bottom and fit the recessed part of this 14" onto it. David
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20-03-21, 10:54 PM
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[quote=Kevin H;10924Alternatively perhaps you could tape a small slab of plasticine to the underside of the bonnet to see if you get an imprint from the post.[/QUOTE]
Kevin, thanks for that idea. I did a variation and made two little columns of plasticene. I put one at the front edge of my new air cleaner and one on the nut on the top. The bonnet pressed them down when closed. This revealed I have 1.25" clearance at the front edge and 1.5" above the nut! So I have room to perhaps fit a larger silenced/snorkel air cleaner if I want. David
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