So i just got it brought to my attention that the straight 5s are a bit troublesome to make exhausts for since you cant pair the last cylinder up with another one to get the pulses right. Anyone got any knowledge on this? work arounds and so on. Been told splitting the fifth is good but i do not like it due to the dual tracts being able to pull the gasses left and right. If this actually is a problem i do not know.
5 cylinder and exhaust manifolds
Started by
MatsNorway
, Jun 15 2014 20:04
11 replies to this topic
Advertisement
#2
gruntguru
-
- 7,683 posts
- Joined: January 09
Member
Posted 16 June 2014 - 05:50
So pairing cylinders (I assume 288* and 432* spacing for each pair) has a torque benefit over a 5-1 system? Even though the pairings are not even-firing?
What do you do with the split fifth - put half into each primary collector?
What about running a longer primary on the fifth and joining in at the secondary collector?
Edited by gruntguru, 16 June 2014 - 05:50.
#3
Greg Locock
-
- 6,459 posts
- Joined: March 03
Member
Posted 16 June 2014 - 09:10
What's the firing order? NA or turbo? What are you aiming at , refinement (nice sounds) or power or torque? what rpm do you want max torque? I don't know what the answer is, but those are things you need to know. i'm assuming equal firing interval.
Edited by Greg Locock, 16 June 2014 - 09:18.
#4
MatsNorway
-
- 2,822 posts
- Joined: December 09
Member
Posted 16 June 2014 - 10:13
I want the pulses come out in even intervals.The firing order is 1-2-4-5-3 on straight fives And the degrees pr firing is 72 degrees on straight fives. I would assume the pulses overlap and that that would vary with the duration of the cam to a certain degree.
Thing is that by pairing in them in primaries first you get perhaps better gains there and can kinda sacrifice the same performance on the single due to the greater total. the splitting sounds like a way to at least get some gain from the single but probably not as much. I want to look into that and figure if it really is a compromise you can not work around.
Edited by MatsNorway, 16 June 2014 - 10:14.
#5
Greg Locock
-
- 6,459 posts
- Joined: March 03
Member
Posted 16 June 2014 - 10:38
Well you can only really have primaries all working at one rpm on a 5. pick an rpm <sorry, late edit>
Edited by Greg Locock, 16 June 2014 - 11:22.
#6
MatsNorway
-
- 2,822 posts
- Joined: December 09
Member
Posted 03 August 2014 - 20:47
What do you do with the split fifth - put half into each primary collector?
That was how i understood it. Btw. What did they do with the V10s?
Sure you can only have it fully optimum at one rpm. But whatever that is. What layout is the best for certain things i wonder.
#7
Wuzak
-
- 8,886 posts
- Joined: September 00
Member
Posted 04 August 2014 - 02:47
That was how i understood it. Btw. What did they do with the V10s?
Sure you can only have it fully optimum at one rpm. But whatever that is. What layout is the best for certain things i wonder.
5 into 1
#8
Kelpiecross
-
- 1,730 posts
- Joined: October 10
Member
Posted 04 August 2014 - 04:55
I have heard that the 5-into-1 were placed around their entry into the collector in their firing order - I would have thought the order would not matter.
#9
gruntguru
-
- 7,683 posts
- Joined: January 09
Member
Posted 04 August 2014 - 06:33
Hmm, a helical wave. A bit like a Mexican wave.
#10
MatsNorway
-
- 2,822 posts
- Joined: December 09
Member
Posted 04 August 2014 - 17:41
Equal lengths. Expect the last one, what is that one from?
It says. F1-247 in the picture info.
Edited by MatsNorway, 04 August 2014 - 17:47.
#12
mariner
-
- 2,384 posts
- Joined: January 07
Member
Posted 05 August 2014 - 09:10
I'm not sure about all teh technical answers but those 5 into 1 F1 exhausts look beautiful.
When my son worked at Renault in the Uk he got a trip to the F1 factory at Witney. He saw the guy who did the V10 exhausts, made of dozens of small sections perfecty TIG welded.
Interestintly the welder was virtually the only welder/fabricator left among 300 staff, eveything , Even then , was CAD/CAM or CF.
