 Header sizes for /4 |
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| stownsen914 |
 Feb 19 2020, 04:55 PM
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Senior Member  Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None  |
I'd like to confirm the proper header primary size for a high performance, small bore 914/4 engine. I recall that 1 5/8" OD is what was recommended back in the day. Is that correct?
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| HAM Inc |
Feb 21 2020, 08:16 PM
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
I'd run a 2-1/4 collector with a nice taper and experiment with tail pipe lengths and shapes.
I was able beat sound readings without a muffler by running a tail pipe that ran from left to right under the trunk tucked up tight with a downturn that pointed at the track. The outlet was out of the line of sight of the DB gun so they never got a good sound reading. The car was louder than they thought. The tail pipe length was ~ 3' long with 2 ~ 90* bends. Not saying that's optimal for your car (or even ours) but some variation of that is what we ran. |
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Posts in this topic
stownsen914 Header sizes for /4 Feb 19 2020, 04:55 PM
yeahmag That's a good universal size. Feb 19 2020, 06:31 PM wndsrfr
I'd like to confirm the proper header primary... Feb 19 2020, 07:55 PM HAM Inc 5/8's is a good all around size on a 4-1 heade... Feb 20 2020, 05:19 PM
stownsen914 Thanks guys for the input.
Len - I hope to get 15... Feb 20 2020, 10:01 PM Charles Freeborn http://www.gt-racing.com/porsche-914-europ...art-9... Feb 22 2020, 12:43 AM |
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