Exhaust cam trial is a go ahead!

[ShireRoller]

Getting another engine tomorrow and will be porting and servicing it ect in the next couple of weeks. Cambelt waterpump thermostat ect.

Anyhow I will be removing the exhaust cams from my current engine to fit in place of the inlet cams on my new engine.

I'll let you know how I get on!

[fastmike]

How will you time the cams up ?

[ShireRoller]

Using tdc setting on crank so can also advance 4°D. An I will set timing from there.

[ShireRoller]

Got the engine out today and removed a few things!
Removing and bypassing the aircon pump will be easy as long as I get the correct length belt.
Also the oil cooler on it seems okay so will do for now.
I will get it cleaned up and ported next week. Those exhaust manifolds need sorting out too they are such a poor quality part!! Ill have a spare engine sat to mock some up on so alls well there too. Watch that space!

[Lukeus101]

Hope it all goes to plan :)

[ShireRoller]

Well the day has been spent grinding the welds out the inside of the manifold flanges. Done 3 on 1 side, Opened up from a ridged 32mm to a 40mm open with a contour to the head.
Ported all exhaust ports opened out from 32mm to 39mm with the contour meeting up to the exhaust mani perfectly. Have cut the 180 degree bend and collector pipe/precat out and will be making an unequal length mani, need to do maths to get it right but I know it will be better than that standard collector/precat!

Inlets to port tomorrow and some more work on manifold and maniwelds *3 more to go*

Cams are in the process of coming out too, Hope I can get the inlet pulleys fitted to the exhaust cams, looks like it will work!

I will somehow attach some photos in the next few days, Going to need telling how to do it mind.

Anyway alls going well, Shall keep you posted!

[Mark S]

do you know why the exhaust ports on the head are smaller than the bore of the exhaust as it meets the head?

[talkingcars]

I guess it's an easy way to ensure that the exhaust gases flow from the head easily.

[ShireRoller]

Yeah, thats why ive taken exhaust port to 39mm an exhaust maniflange to 40mm with an nice smooth contour so it flows out nicely.

[ShireRoller]

I have not gone into the head, mearly opened out the end of it so its better than the standard cast item with a lip running around it.

[ShireRoller]

http:// http://i59.tinypic.com/2kpoc5.jpg

[ShireRoller]

http://i59.tinypic.com/2kpoc5.jpg

[ShireRoller]

http://i58.tinypic.com/2v1u6fs.jpg



manifold ports now.

[Mark S]

if you can lengthen the primaries you may see some gains too.

[ShireRoller]

I will just be sticking with the standard primarys for now, limited to the tools I have right now as far as big bends are concerned.No 180 degree collector an precat though, need to do some maths to work out the right unequal length. Im sure anything will be better than that origional collector!

[ShireRoller]

Secondarys will be longer though, may help a little! 2.25 secondarys into 2.25" Y piece to a 2.5" single box system that I have made

[ShireRoller]

So, As primarys will remain relatively equal length. An the secondarys will be joining quite far back, I cant see it robbing power only making more as it flows much better.
I guess im just looking for a little feedback on design!

[ShireRoller]

just done a little math..
primary and secondary pipe length should be around

At 6000rpm 29.5"
At 5000rpm 36.1"
At 4500rpm 40.4"
At 4000rpm 45.8"
At 3000rpm 62.1"
At 2000rpm 94.7"

I will measure primary length of standard manifold tomorrow when I get to the garage.
Also found a nice 2,25" 180 bend on a nice radius that should fit so I will be able to stay equal length after all!

[ShireRoller]

Have the mockup manifolds done after alot of trimming measuring adjusting 1000 times over.
Finally have them both equal length at 33.5" so if my maths is right should help peak power!
Original primary and secondary length was around 25" so that would make its peak power somewhere over 7000rpm!!!

heres a few pics. Need to order a few bits of pipe a start welding!
Also when Y pipe it connected to secondarys,It should properly line up with the center section!

[ShireRoller]

http://i59.tinypic.com/ftiur7.jpg


http://i60.tinypic.com/hwhd21.jpg


http://i59.tinypic.com/2igcftg.jpg


http://i58.tinypic.com/30n7jo7.jpg


http://i60.tinypic.com/20rqq6a.jpg

[Skillen]

Great DIY'ing!
Isn't making the primaries longer where you'll get a better benefit?
Or does it not really matter as long as the combined is equal?

[ShireRoller]

For a V6 IIRC its the total primary and secondary lengths!
If I have enough room I would like to join the 2 secondarys with an X pipe first, before the Y pipe. Doing a little more research into H and X pipes on V6s but not going to lie I feel like im rowing through the mist regarding those.

[ShireRoller]

Well, Got the cam ladders off today an noticed straight away a lack of cam position sensor on the exhaust cam. So its all she wrote on that one! Still glad I had a look into it an put it too rest!
Havent bothered porting out the inlets as there only 1mm smaller than the exhaust ports. An match up with no step to the lower inlets so seems a little pointless there unless custom lower inlets are used.
Might have a little look around for some 190 cams if any are going cheap, until then need to finish the exhaust, get a cambelt kit, water pump and stat. clean an paint engine. Go across the country to pick up another 180 in tahiti blue. Cant see the engine been in for POL but if I get my exhaust mani done in time I'll fit that to my car as it is to test!
Also anyone have much experience of advancing the timing by loosening the inlet main pulley an advancing that way. Going on the assumption that when the pulleys perfectly central on the camshaft, thats 0degrees. moving the pulley anticlockwise advances slightly. An moving the pulley clockwise retards?
There is no adjustment on link belt side.

[Skillen]

I think the heads I got off Stephen were 190 heads
I don't need the cams so ill find out and let you know.

[ShireRoller]

Really?! That would be great!
Is yours already cammed Skillen?

[Skillen]

Really?! That would be great!
Is yours already cammed Skillen?

Yeah it has piper 270's on it (albeit without the pulleys annoyingly).
The heads are unused at the minute and the cams are just sitting in them.
I'll take a look after the weekend as I'm working Saturday and Sunday if that's alright.

Edit: they came from a 190 engine I just checked.

[ShireRoller]

How is it with the cams?
An awsome stuff, What will this cost?

[ShireRoller]

just ordered the 180 bend an Y pipe so hopefully have the 1st attempt on soon!

[Skillen]

Seems livelier. But tbh I've not had it On a Dyno yet or mapped (will be by next month hopefully) so it may be a little placebo also.
Make me an offer on them :) I'm not wanting stupid money lol they're a second spare at the end of the day lol

[ShireRoller]

im terrible at offers, I only need the inlet cams, still not a clue though!

[ShireRoller]

Update!

Getting a little further with the exhausts manifolds. Won't get chance to do anything tomorrow as it Pride of Longbridge.
Sunday I'll try an get over to my friends workshop to use his welder. Should be finished and on by mid next week.
Will first fit using the standard primarys, So I have a better idea if my secondarys and collector have actually made a difference.

After that I will fit the primarys I have filed the welds out off an see if that helps a little.
After that will maybe try an join each bank with an X pipe and see how that works too.

Here's a couple of pics from today of the rough layout I have now.


http://i60.tinypic.com/2im5jrr.jpg

http://i59.tinypic.com/biktp3.jpg

[Mark S]

the radius bend is too big to fit between sump and bellhousing, which means it will sit underneath, which is fine, but you will need to watch the height, esp if you lower the engine or car.

[ShireRoller]

It just squeezes in! It, will sit about 1\4" lower than the precat does as the bend goes under. Plenty of room though! Worst case I can heat and flat the bend a little!
I just think its insane you know this just from a photo!

Mind... Blown...

[ShireRoller]

Secondarys are made and on in there first incarnation. Will order more pipe and remake a neater in a few months.
Equal length, ended up been 36".
Gave up trying to make it all fit inbetween the sump and bellhousing so collector is under gearbox to aid clearance. Have ordered some heat shield for the bottom of the gearbox to fit this weekend just to be safe. Need to refill with 99RON, reset ecu and go for a run. I'v been for a drive in it an low end power is better, Mid feels better as well. Haven't properly tested top end as need to change fuel and give it abit, maybe im just been paranoid. The gunky looking stuff is 2 part epoxy that I always cover welds with to stop them rusting. Then goven a coat of redoxide to try an protect the piping. I wont win any welding medals but there strong and gas tight.


http://i61.tinypic.com/2mlmcw.jpg

[Mark S]

http://i1113.photobucket.com/albums/k506/mark_smg/17061501320_640cdb5b38_z_zps2zjtd4gp.jpg (http://s1113.photobucket.com/user/mark_smg/media/17061501320_640cdb5b38_z_zps2zjtd4gp.jpg.html)

another way to do it...

[ShireRoller]

Have you got a better pick of the rear bank Mark?
I'd like to do something like that but will really struggle to make the 3 into 1 collectors and to buy they are so expensive! They look real nice though, what diameters have you gone with?

[Skillen]

Not gonna lie, I have no idea how to interpret that picture mate