I noticed on my aftermarket headers the heat riser inlets where not drilled. I was reading some old posts that suggested that headers don't have pressure but they pulse instead. If I were to drill the inlets out should I drill a smaller hole on one side or just try and drill them as large as possible?
vw54 ·
drill as large as possible so the gas flows n wont block up the tube
vw54 ·
drill as large as possible so the gas flows n wont block up the tube
Bizarre ·
The gas will only puls as both the tap off points are at the same pressure.
If you look at stock ones the RHS take off point is next to cylinder #2 where as the LHS connection there is actually a tube that takes it to a low pressure point near the collector
This means the exhaust "flows" from right to left
Common headers have RHS take off at #2 and LHS at #4
So at best the gas "pulses" back and forth
Be carefull drilling as the blanked off bit is on a curve
Also most of the take offs are not welded properly and are not fully sealed
Personally - living in Qld i would think it is all THAT important
But yes - it is better if you can do it properly
alien8 ·
So, a return to a stock system is sounding pretty good.
Bizarre ·
Depends what you want
Is you carb icing up??
Headers will/should give "some" gain over stock
As i said before, i would be surprised if there wasnt enough conduction of heat to warm up the risers.
mine doesnt "sizzle" when moisture is placed there but it is hot to hold
I am running the stainless steel VW type header thing that fits in the stock position
I dont get icing and it was single digits here in Sydney this morning
alien8 ·
I had a aftermarket Thunderbird quiet system on my 1600 tp for the last month and a half and it never seemed right. Not that there is a fault with the headers as they are pretty well made I think. It just dosnt seem to run well. I have noticed condensation around the manifold and bottom of the carb. I guess it must be the cold humidity up here or somthing.
Anyway I put the stock system back on last night and cleaned out the riser pipe. I must say its running like a dream. I have been driving it all morning and the missus noticed the difference straight away when she did the school run. It seems to have more pickup.
I must add that this is only my experience with my car as I am sure other people have had good success with aftermarket systems but I think I am going to leave the stock setup on there for now. Maybe I should drill the riser inlet on the headers and test that. Nar I think I'am done.
Anyone want a Thunderbird quiet type system?
68AutoBug ·
alien8 wrote:I noticed on my aftermarket headers the heat riser inlets where not drilled. I was reading some old posts that suggested that headers don't have pressure but they pulse instead. If I were to drill the inlets out should I drill a smaller hole on one side or just try and drill them as large as possible?
On My VW muffler the exhaust flows from the left at the exhaust port across to the RHS where it exits into the muffler via a pipe..
LEE
Bizarre ·
if you look at the heat riser take off on the RHS it is tapped into where #2 exhausts
On the LHS you can see the pipe weave its way down and disappears near where the gasses exit to atmosphere
Joel ·
Semi autos use the mex style with the exit on the rightside for ATF pump clearance
Brad you would need to do some slight jetting changes to make the best of that exhaust
its the same thunderbird quietpack i run and its 1.5" which is enough to warrant a jetting change
properly tuned and setup you shouldnt have dramas with icing, there will always be a bit of sweating below the carb, thats normal
i ran a quiet pack on a stock 1600 for years and im only an hour south of you so no change in climate and never had probs with icing
naturally its not as good as a stock muffler setup but i was happy enough with the performance and economy gains that an occasional rough idle didnt worry me
colonel mustard ·
alien8 wrote:Anyone want a Thunderbird quiet type system?
Photo's and how much...
alien8 ·
Hey Joel, Yeah I played around with the jetting, a lot. Convinced myself that it was cause of the 009 so I got a SVDA, which was the best thing I could do regardless.Thought it was a bad coil, dud carb, vac leak, point, plugs etc, etc. Just couldn't get it to run just right. I did eliminate a lot of the problems I was having. I mean it wasn't running totally bad, just enough to be annoying.
When I first got the car it ran great. It had a worn 34/3 and a 009 with a stock exhaust and stunk of petrol but it ran really well. Better than recently and with all the money I had spent on "upgrades". I will try a different system in the future but for now the stockie rules!
alien8 ·
colonel mustard wrote:
alien8 wrote:Anyone want a Thunderbird quiet type system?
Photo's and how much...
Pics tonight.
$130
Joel ·
generally with a stock carb the stock exhaust works best
if u want to go extractors on a stock 1600 then 1 3/8" works best just stay away from empi systems