My new exhaust

Hi guys,
Just fitted up a new system yesterday. Its a fully merged S & S 1.58 inch header , with the collector cut back to a full 2 inches, then it goes into a fully merged 2.5 inch pipe into a 2.5 inch straight through muffler.
It replaces my 1.5 inch system which didn't have a merged collector, went into a 2 inch pipe & into a 2 inch muffler.

Seat of the pants so far , with a passenger, it feels as though the motor has really been woken up, it wheel spins in 1st, 2nd & chirps in third & thats in the dry. I'll try to get onto the dyno early this week as this will tell the real story.
I also think that I'm going to have to get some smaller airs for the Dells, as I think with the bigger system it will leaning out more.

Next will be some headwork to the stock port 040 heads to see if that will make any difference.

regards
Jak

.

mmmmm nice, very nice

looks good jak, is it any louder with the bigger pipes?
What power was it making with the old system?
Should be a good comparison to see what it will do after you dyno it.
Cheers

Hi Dino,
I was worried that the new system was going to be too loud, especially with the car being driven every day. When I looked through the new muffler & I could easily see my muffler guy out the other side I was a little concerned. But after it was finished & we started it up we were both very surprized. Inside it sounds the same as before driving on the street, can still hear the stereo & have a conversation, but it has a real blat to it when u get over 5000rpm, it sounds fantastic, it just has a low rumble at idle which sounds quite good too.
Last time on the dyno it had 105hp @ 5300rpm & since this is the only change that I have made it will be a good comparison, in reality it may be only good for 2hp or so at the wheels, but it definantly feels as though the engine is having an easier time breathing & even the throttle feels crisper as well. Of course the limiting factor is the heads but the new exhaust will do for a little while.
Jak

Hi Jak,

I had a 2 litre bug a few years back..40x35 heads, ported and 48 dells....my mergerd header was the diference between scorching hot 4's and barely beating them.

The crispness is the torque caused by the collector. The air accelerates through the restrictor giving back pressure yet causing a vacuum for the opposing cylinder....

I would never use another type of exhaust again after my brief experience going from a collector(old one rusted out) to a standard extractor and back again.

Good luck on the track...when I get the 2332 finished I may see how this green aero bug that Richard built actually stops and turns. Looks good in the garage with no engine.

Matt

Jak,
Nice job, who did the work? Are going to get it coated? If not I've got some POR15 Hi Temp coating you can have (grey).

Brendan
0410 442 596

:jesus

Hi Brendan,
I'm having the 4 primary pipes off the heads ceramic coated silver/chrome, but not the rest as its in the open air & it would stand out like dogs balls.
I was going to paint the rest in Por 15 heat resistant paint. I need black though so u can't see it as much, thanks anyway. Where did u get the por 15 from, can we get it on the Coast?
I want to do my tinware as well.
regards
Jak

Jak,
Colorview on Wyong Rd Tugerah is a POR dealer.

R
Brendan:jesus

Jak, you have that whopping big spoiler hanging off the back, but you don't want people to notice the exhaust? Howcome? Something to do with ground clearance maybe?

As far as my tastes are concerned, I prefer to look at a spoiler as apposed to an exhaust.
Jak

Fair enough, was just curious... thought there may have been some legal consideration maybe. 🙂

Very nice

But I don't quite understand where the other 2 pipes are? 4 pipes from the engine but I only see 2 leading into that tasty looking spagetti....

CU
Jeremy

Hi Jeremy,
I just didn't have the rear J-pipes on for the pic thats all.
Jak

looks good,can you get the same thing made for a type3 square,,,,
cheers

I'm not quite sure, since u have the type 3 fan housing to contend with I think it gets in the way, but I may be wrong? I think your rear apron is a problem as well??
regards
Jak

Jak Rizzo wrote:Where did u get the por 15 from, can we get it on the Coast?
I want to do my tinware as well.
regards
Jak

Hi Jak, have you changed tinware, I thought yours was already ceramic coated?

Exhaust looks good.

U are getting me mixed up with Paul. he has all his tinware coated.

I have owned a T3 S and S header, major difference is that pipes from 2 and 4 go from the head - then turn out towards the guards then back in to the collector.

Got the car on the dyno this morning, only got 108.8 @ the wheels, but the power is coming on earlier & for much longer. It's also running dangeroulsy lean. I have ordered some 150 airs to replace the 170's that are in it. I also didn't use the power pulley either, forgot to change it over.
Just as a comparison to the last dyno run to this one.
Before & after exhaust change
70hp@3200rpm 70hp@3300rpm
100hp@4800rpm 100hp@4600rpm
105hp@5500rpm 108.8hp@5500rpm
96hp@6200rpm 106hp@6200rpm
U can see it dropped off quite sharpe before.

Any thoughts comments most appreciatted.
regards
Jak

[Edited on 25-6-2004 by Jak Rizzo]

You would have to be happy with an extra 10hp @ 6200 - must really make it feel stronger in the top end ? Sounds like there might be a bit more hiding in there too......

Plus it looks well tough too !

Seat of the pants Doug it feels equally stronger all over, but the dyno readout says otherwise.
Once I prevent it from being so lean up top there should be some more power in it as well as well as keeping it safe at high revs.
I'll go back again next week & keep those who are interested posted.
I'm also saving my coins for some 42x37 044 heads from CB. They will replace my 40x35 040's & I'll raise the compression from 9 to 10. I've been practicing porting heads with some 40x35 044's that are going on a 1641cc that I'm currently building so I'll port my new heads myself.
When I built my mates 2110cc I set the comp at 10.1 & thats with 42x37 044's with massive ports & it's running very well staying very cool on the track & the street. he also got 106.8hp @ the wheels with more tuning with jetting to come.
So with my stock port heads I feel there is much more to go with my motor yet, especially once I get the air fuel ratio right.
regards
Jak

That's a fairly good improvement considering you should get a few more ponies once you get the jetting sorted
Cheers

Imagine what your 2.7L is going to put out Dino, Holey Dooley!
Can't wait !
Jak

Jak, out of interest, what cam are you running ? and what went into the 2110 ?

I'm running a K-8 & the same went into the 2110cc.
Jak

Are you running 1.4:1 rockers ???

Wow jak nice result

The power curve is very smooth and progressive

Adrian, I'm running Berg 1.4's in my 2.3, but I put CB 1.25's on the 2.1.

Hi Jon, yeh it's really nice to drive, been driving all day with the family in it & because of the tourqe theres no need to take it over 3500rpm on the street. Notice that the power starts to curve when the air fuel gets over 13 into the lean zone. I wonder if when jetted properly , if it will keep climbing rather then curving off?
Jak

Hey Jak,

Did you ever run 1.4 with that cam???

If it gives poor performance on a fk10 with 1.25's then You would think the same with the fk8, only because they were designed to run only with the 1.4 or 1.5...
Still good power espcially with valve size and running lean.
Just wondering what could happen if the recommended rockers were used...from the fk10 comparision I saw.. from 3500-6500 could experience a pretty noticable bump. My 1.4's are new...throw them on race around the block and them put them back in the wrapping...see what happens.

Matt



[Edited on 27-6-2004 by boof2332]

Yeh Mat , we did run cheap crap 1.4's on the 2.1 for a while but they kept falling apart. When I rebuilt it we just put some 1.25's on for reliability more than anything. It's been perfect ever since.
The 2.1 still has some more tuning to go & can also have a bigger pipe & muffler off the 1.5 header like mine, so theres more in it.
regards
Jak

Jak Rizzo wrote:Seat of the pants Doug it feels equally stronger all over, but the dyno readout says otherwise.
Once I prevent it from being so lean up top there should be some more power in it as well as well as keeping it safe at high revs.
I'll go back again next week & keep those who are interested posted.
I'm also saving my coins for some 42x37 044 heads from CB. They will replace my 40x35 040's & I'll raise the compression from 9 to 10. I've been practicing porting heads with some 40x35 044's that are going on a 1641cc that I'm currently building so I'll port my new heads myself.
When I built my mates 2110cc I set the comp at 10.1 & thats with 42x37 044's with massive ports & it's running very well staying very cool on the track & the street. he also got 106.8hp @ the wheels with more tuning with jetting to come.
So with my stock port heads I feel there is much more to go with my motor yet, especially once I get the air fuel ratio right.
regards
Jak

TextHello Jako,The motor is starting to come together,breathing is the key for this motor and the heads will make alot of difference just be carefull of cam sizes some times bigger is not better and this why some dont breath properly and they go backwards.It wouldnt hurt to maybe when receiving new heads to look into porting them a little more,just something to think about.JVLRacing

Jak Rizzo wrote:Yeh Mat , we did run cheap crap 1.4's on the 2.1 for a while but they kept falling apart. When I rebuilt it we just put some 1.25's on for reliability more than anything. It's been perfect ever since.

Jak

Did you notice any power difference (gain/loss) by changing the rockers?

Unfortunantly Craig I didn't get to do a back to back test, as I changed the cam, compression , rockers & carbies all in one go. Power went from 88hp @ the wheels to the 106.8hp @ the wheels.
I read on the Shop Talk Forums that some of the guys thought that there was more tourqe with using 1.25's on the K & FK series engle cams, but then they also said that using the 1.4's made the engine feel a little "peppier" so it may be a case of 6 ways or half a dozen, ?
Jak

Craig,
what I was talking to Jak about related to a comparison that i had with a fk10 that they used 1.25's on to see if it made power sooner ...it was dissapointing. The engle fk series was designed to perform a specific way with a specific rocker...I too thought of possibly doing it instead of changing my fk10 ..glad i didnt.



matt