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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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| Posted:
Fri Apr 23, 2004 6:31 am |
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| stan wrote: |
this is for flat out performane, when a restrictor is often used, its a way around the restrictor--having enough air available to cope with a few seconds of snap acceleration.
thats before u start saying a standard one isnt even that big....... |
(second post on the topic  ) |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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| Posted:
Fri Apr 23, 2004 6:35 am |
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and because in motorsport throttle bodies are usually used........
like i said its a way round a restrictor |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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| Posted:
Fri Apr 23, 2004 7:54 am |
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and whatever volume ur plenum is, will there be a point wher eu get restricted airflow simply byt he size of the throttle plate....ie at 8000rpm could the engine be needing more air than can be flowed thru a given plate size? and how can u calculate this? |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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| Posted:
Fri Apr 23, 2004 8:05 am |
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there is always going to be a restriction with a plenum.......that is part of the reason why individual throttle bodies are used.
"ie at 8000rpm could the engine be needing more air than can be flowed thru a given plate size?"
could be, but it would depend on how well the flow thru the head is as to how much of a restriction there would be.
for instance, if u've got a shit head/cam and flow is crap anyway, then a throttle restriction wont be as great as if u had amazing flow thru the head (high valve lift, good duration etc etc), but with the same throttle plate
wot (I mean what really) do u want to calculate? |
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JB
Mr Quoter-vator
Joined: 16 Feb 2004
Posts: 7405
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| Posted:
Fri Apr 23, 2004 8:19 am |
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if the size of the plate sayon the f7 is big enough..too big...? cos the area of that TB compared to 4 Tbs is a lot different |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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| Posted:
Fri Apr 23, 2004 8:24 am |
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it is possible calculate flow thru an orifice, but u need to know actual velocities
i think that it would be more a case of measuring flow thru the plate on a flow-bench and comparing it to flow thru a set of TB's. |
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stan
Gay Rights Activist
Joined: 07 Apr 2004
Posts: 1268
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| Posted:
Fri Apr 23, 2004 8:27 am |
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i've considered making a bigger, single throttle body before......never done it tho!! |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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| Posted:
Sat Apr 24, 2004 1:33 pm |
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uh-hu very good.
1.5 times the engine size is ample, anything with over 6 cylinders can do with much less plenum volume. |
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