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Re: advice on finishing my mild a14 motor
Home away from home
Joined:
2010/3/20 12:20
From Sydney Australia
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Posts: 238
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That is a good grind for a full house Rally engine with something over 11>1 comp and a pair of twin sidedraught webers or dellorto or Solex carbs,way more than what you seem to intend the motor for use wise.

General rule of thumb for street use higher lift with shorter duration makes a good road cam as it retains good vacuum and pumping efficiency.
Cams with longer duration mean the piston is half way up the cylinder on the compression stroke before the inlet valve shuts and therefore feels sluggish to respond but revs out OK when it gets out of it's own way,That is why when you go to a bigger cam grind you need higher comp engines.
Most of the blocks and heads around these days have already been mmachined in the past so every one needs to be evaluated individually as to just how much they can be machined for optimum results,then add in is it a stock or stroker crank sauch as an A15 crank in a smaller engine or a big bore rebore as they all effect Compression ratio.

Just how high you can go depends on Ignition system Mixture quality (ie How good the Carb,Manifold and Exhaust work togrther) and just what we end up with fuel quality wise,For example in the past LPG conversions upped compression to make the same power as conventional petrol engines then the Government dropped the required octane rating of LPG available at the bowser and suddenly good working engines started having problems due to fuel quality being lowered.

Much to be aware of when planning an engine build for street use these days isn't there,but at least you are clued up enough to ask which helps get the good results.

Posted on: 2011/11/1 11:56
Transfer the post to other applications Transfer

Subject Poster Date
     advice on finishing my mild a14 motor Matto1kUte 2011/10/25 5:27
       Re: advice on finishing my mild a14 motor bige 2011/10/25 6:18
         Re: advice on finishing my mild a14 motor Matto1kUte 2011/10/25 6:31
       Re: advice on finishing my mild a14 motor bige 2011/10/25 6:49
         Re: advice on finishing my mild a14 motor Matto1kUte 2011/10/25 6:52
           Re: advice on finishing my mild a14 motor Matto1kUte 2011/10/25 7:35
       Re: advice on finishing my mild a14 motor bige 2011/10/25 7:56
         Re: advice on finishing my mild a14 motor Matto1kUte 2011/10/25 8:45
           Re: advice on finishing my mild a14 motor Matto1kUte 2011/10/25 8:55
       Re: advice on finishing my mild a14 motor bige 2011/10/25 8:55
       Re: advice on finishing my mild a14 motor DISMO 2011/10/25 9:29
       Re: advice on finishing my mild a14 motor estyre 2011/10/25 20:23
       Re: advice on finishing my mild a14 motor coxsteve 2011/11/1 11:56
       Re: advice on finishing my mild a14 motor DISMO 2011/11/1 12:05
       Re: advice on finishing my mild a14 motor bige 2011/11/1 12:14
       Re: advice on finishing my mild a14 motor Rallytwit 2011/11/2 4:22
         Re: advice on finishing my mild a14 motor elemental_funk 2011/11/2 8:30
       Re: advice on finishing my mild a14 motor bige 2011/11/2 9:30
       Re: advice on finishing my mild a14 motor DISMO 2011/11/2 12:08
         Re: advice on finishing my mild a14 motor estyre 2011/11/2 13:48
           Re: advice on finishing my mild a14 motor dattoman_1000 2011/11/2 13:56
       Re: advice on finishing my mild a14 motor Rallytwit 2011/11/5 1:59




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