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Duratec Header Temps
http://www.locostusa.com/forums/viewtopic.php?f=4&t=14682		 Page 2 of 2
Author:  TooBusy [ February 12, 2013, 1:43 pm ]
Post subject:  Re: Duratec Header Temps
Love tinkering with the SU's takes a while to learn, they are really fantastic pieces of machinery.

I especially liked the fact that I could "tune" a portion of the range simply by taking a nail file to the needle. I spent more time looking at spark plugs on my A-H Sprite than Id care to admit.
Author:  john hennessy [ February 12, 2013, 4:15 pm ]
Post subject:  Re: Duratec Header Temps
hey TB, there are no short cuts to performance.
Author:  TooBusy [ February 12, 2013, 4:25 pm ]
Post subject:  Re: Duratec Header Temps
john hennessy wrote:
hey TB, there are no short cuts to performance.


true. I spent a lot of hours and too many dollars to get a 1275 A series from 58 to 80hp

It's funny, I'd rather drive a slow car fast than a fast car slow.

Sorry for the sorta threadjack a.moore. Hopefully you picked up some good go faster tips from John's post. There are a couple of valuable nuggets in there.
Author:  papak [ June 4, 2019, 5:46 pm ]
Post subject:  Re: Duratec Header Temps
I have about 2000 mi on my 2.3 Duratec. I’ve noticed that the #2 and 3 primaries run about 100 degrees cooler than 1 and 4. My exhaust system is a 4/2/1. The secondary for ⅔ has nearly no blueing but the ¼ pipe is definitely blue. The engine idles and runs very smoothly. The ITV butterfly’s are well balances. The injectors were cleaned and balanced prior to installation. I am running Crower Stage 1 cams. Unbeknownst to me at the time I ordered them, they were ground with 4 degrees of advance to accommodate emissions compliance. I took this out with adjustable sprockets. I’m wondering if there were any other emissions compliance in the grind.

Anybody else experience this?
Author:  papak [ June 4, 2019, 5:56 pm ]
Post subject:  Re: Duratec Header Temps
Spoke with Crower tech support. They don’t change anything for the inboard cylinders. I wonder about the porting.
Author:  a.moore [ June 6, 2019, 8:33 pm ]
Post subject:  Re: Duratec Header Temps
How do the primary lengths compare across cylinders?


TooBusy wrote:
Sorry for the sorta threadjack a.moore.


Apparently I forgot about this thread. I guess the Sprite purchase 9 months later distracted me. ;)
Author:  papak [ June 6, 2019, 8:54 pm ]
Post subject:  Re: Duratec Header Temps
Equal length. No help there. A friend, a retired automotive engineer, suggested that the coolant flow at the center of the head in-between the center exhaust ports might be different that that adjacent to the outboard ports and contributing to the observed difference. He thinks it is of no consequence.
Author:  rx7locost [ June 7, 2019, 8:41 am ]
Post subject:  Re: Duratec Header Temps
I would read the spark plugs. If I see no discernable differences, I would ignore the header blueing and move on to the next issue.

Just for fun, you might swap the 2-3 and 1-4 injectors just for confirmation that they still are performing equally. But I really don't think that it will show anything different.
Author:  papak [ June 8, 2019, 12:35 pm ]
Post subject:  Re: Duratec Header Temps
I did both with no change. Moving on to replace the clutch that blew at the track last weekend.
Author:  john hennessy [ July 2, 2019, 2:07 pm ]
Post subject:  Re: Duratec Header Temps
perhaps valve lash is to blame or can be used to correct. as in more lash equals less cylinder charge.
Author:  davew [ July 3, 2019, 7:18 am ]
Post subject:  Re: Duratec Header Temps
More air flow around the two out side header pipes. You can is that condition on some I-4 M/Cs with a touring fender and large mud flap even with double wall headers. Davew
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