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Old 03-11-2012, 01:20 AM   #1
azironhead
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Default Turbo Ironhead Project

Alright guys here we go! I have had this project for 15 years. I kinda lost heart when I had it at the shop and they lost (sold) some parts. Fortunately it was easy stuff to find like a clutch basket and setup for an 85 and some other things. Then marriage and kids happened and it just got put off.
Well here we go! Gathering parts and the build is on!
So far the clutch basket and clutch are on the way. The HSR45 is in the garage. The Wiseco 7.5-1 pistons are here. The Garrett T25 is on the way. The starter is on the way.
Once the turbo is here I'll install the cylinders and carb and mock up a manifold.
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Old 03-11-2012, 07:40 AM   #2
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Default Re: Turbo Ironhead Project

for street or strip? gas or alky looks like a good start
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Old 03-11-2012, 11:53 AM   #3
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Default Re: Turbo Ironhead Project

Street and gas.
It has an Accel crankpin, S&S Rods, Wiseco 7.5-1 forged pistons, .590 lift cams with 40 degrees of overlap, heads were ported and flowed by Flo Headworks. They also did a no lead conversion and dual plugged them.
Should be able to push 15 pounds of boost pretty easy with the lowered compression.

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Old 03-11-2012, 12:44 PM   #4
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Default Re: Turbo Ironhead Project

Cool Project you got going on here..

Say....I would like to see the cam specks...??

Reason I'm asking for this.
Want to play with the Accelerator Program some with your motor build specks....
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Old 03-11-2012, 03:37 PM   #5
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Default Re: Turbo Ironhead Project

240 int. duration @ .053
248 ext. duration @ .053
18/42 int. open/close
46/22 ext. open/close
.590 int. gross valve lift
.590 ext. gross valve lift
TDC Lift Exh. .166"Int. .192
1.6 rocker arm ratio

I have to check my rocker arm ratio. I have an 85 ironhead and the ratio may be 1.45 or whatever was used in the older motors. If so I should still get decent lift. It is the duration that I'm really after.
With the turbo I need to keep my duration low so I don't blow the intake charge right out of the exhaust. These cams are a compromise. Good lift with a little duration. To much? We'll see. If it is to much I'll put a set of stock cams in. Stock cams have an overlap of about 17 degrees.
Interested to see what your program says.
I also have some 10.5-1 pistons but I think it would be to much for an ironhead even at low boost.
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Old 03-11-2012, 07:41 PM   #6
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Default Re: Turbo Ironhead Project

Yeah, I certainly wouldn't put 10.5's in there with ANY boost. You'll get a rod through shot through your sternum... Course, I'm paranoid. Ask dragstews what i'm doing with MY ironhead. LOL
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Old 03-11-2012, 09:17 PM   #7
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Default Re: Turbo Ironhead Project

Whachya got goin on with yours?
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Old 03-11-2012, 09:19 PM   #8
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Default Re: Turbo Ironhead Project

He is lowering the compression so he does not kill his ironhead. I on the other hand am putting the hate into my engine.
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Old 03-11-2012, 09:21 PM   #9
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Default Re: Turbo Ironhead Project

De-tuning, and putting on a smaller rear sprocket, so I can ride to work at low RPMs for 10 years without taking it apart.

Matt, however, is channeling satan via ironhead. He wishes to have a posessed bike.

I'll be watching this thread, looks fascinating. I'd like to build a turbo bike at some point. Probably not an ironhead, though.
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Old 03-11-2012, 09:34 PM   #10
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Default Re: Turbo Ironhead Project

Ironheads hate low RPMs .... Makes the pistons slap on the front and backs of the skirts.
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Old 03-11-2012, 10:00 PM   #11
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Default Re: Turbo Ironhead Project

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Ironheads hate low RPMs .... Makes the pistons slap on the front and backs of the skirts.
Alright. I don't mean 350 RPM. I just mean I can cruise at 70 without rattling my ass off and getting decent gas mileage. But yeah, we shouldn't hijack the man's thread. =D
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Old 03-11-2012, 10:31 PM   #12
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Default Re: Turbo Ironhead Project

I'm curious how your gonna lube the turbo? You gonna have a seperate tank and pump, cause an iron pump isnt gonna give ya the volume your gonna need. Not trying to sound negative, just curious. I have turboed a couple old KZ's, and the oiling system on those was barely adequate. I will be watching this close, there isnt much better then a properly setup turbo motor comin on boost. I've got a 2L Saab runnin about 20 lbs boost, its a riot.
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Old 03-11-2012, 10:36 PM   #13
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Default Re: Turbo Ironhead Project

Yeah, I was wondering the same thing. I did a lot of research on turbo KZ's 10 years ago. I'll be watching for sure. (FeHd: I love KZ's. First bike was a KZ... before I got rid of it, it ended up with a 1396cc big block from APE... and other goodies...)
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Old 03-11-2012, 11:41 PM   #14
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Default Re: Turbo Ironhead Project

I've got a couple of ideas for the oiling system. The turbo itself doesn't need that much pressure. It will drain back into the cam chest. I'll have to drill and tap a return line into it.
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Old 03-12-2012, 08:38 AM   #15
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Default Re: Turbo Ironhead Project

Your right, it doesnt need alot of pressure, but it does need alot of flow. I dont think putting into the cam chest is a good idea, the pulsations of air will interupt the drain flow from the turbo causing all kinds of problems. Again not trying to be a buzz kill, but I have been messing with hair dryers for quite awhile now, and an ironhead does represent some unique challenges for one. It might be better to have a completely separate oiling system for the turbo.
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Old 03-12-2012, 08:57 AM   #16
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Default Re: Turbo Ironhead Project

Should be alright with the return line running to the cam chest...
It needs to be fairly large in size...Say perhaps 5/8" or 1/2" I.D.

===============================================

This is a draw thru Garret with a Super G on a 96" S&S Super Stock Evo...



Rechambered the heads and ran a reverse dome pistons from J&E to get compression down to 8. 1

Returned oil from blower dropped into cam cover.
No problems came from this...Did use a HVHP oil pump with a bleed off feeding the motor but not the unit...
Ran 8 pounds of Boost.

Last edited by Dragstews; 03-12-2012 at 09:15 AM.
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Old 03-12-2012, 09:12 AM   #17
CB550 Matt
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Default Re: Turbo Ironhead Project

I would like to start this post of saying I know almost nothing about turbo setups.

what about running a smaller higher feed rate oiling system with a electric pump. You can run it through a cooler and with lower wieght oil to keep up the flow. plus a pump fail can disengage the turbo clutch if you are running a clutch on it.
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Quote:
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The rev limiter appears to be the size of your balls.
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Old 03-12-2012, 09:38 AM   #18
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Default Re: Turbo Ironhead Project

A Intercooler is a grand idea to run...BUT..

With a Turbo of that design it will need to spool up to make boost.
When it does, it won't be very long till your looking for the next higher gear.
Being a four speed and taching fast to red line (I strongly suggest a rev-limiter) you will more then likely be backing out of the throttle, unless your at Bonneville....
================================================== ==

Boost is FUN....Instance 30 - 40 or more Pony's join the herd depending on how much boost.....



With big time HP going on. Guess there is not much need to say overkill the build as far as lower end and tranny.
================================================== ==

This unit on my Buell works really well on Harleys
Being a variable pitch vane that controls the boost...Comes on at a low rpm...No need to tach high numbers to make boost...







These are kinda twice the Dollar then the Ray-Jays or Garrets units.
And they have there own oil supply...No need for the motor to pump oil to the unit.

================================================== =

One other thing....
When the Cop tells you that you left 20 feet of rubber back there..
DON'T argue with the Man, saying it had to be at least 30' or 40'
That don't go over well with them boys.....At All..!!

Especially if the Motor-Cop that pulls you over is wearing this size Helmet...


Last edited by Dragstews; 03-12-2012 at 02:29 PM.
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Old 03-12-2012, 11:50 AM   #19
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Default Re: Turbo Ironhead Project

The Garrett I have coming today is a VNT25 variable vane very similar to the aerocharger. Should spool up nice.
There are quite a few turbo Sportsters running around with the oil return going into the cam chest. I think it should be fine. If not I have a line on a pump and will probably do a stand alone system however I do not think it's I'll have to.
If I was doing bonneville or something where I was WOT I would do an innercooler. For the street I don't think it will benefit hugely.
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Old 03-12-2012, 05:41 PM   #20
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Default Re: Turbo Ironhead Project

Allright! The turbo, starter, and front brake caliper arrived today! It was like Christmas!
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