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  #1 (permalink)  
Old 03-13-2012, 09:50 PM
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Where do I find a high scavenging sportster style oil pump?

Greetings Folks,

I've just fired up a 120" Delkron 4 cam drag/street motor, and am having major scavenging issues. I talked to Delkron, who said the scavenging area in that case is small, and the only solution is to use a ProFlow oil pump. Called up zippers today to order one, and was told the manufacturer is no longer providing these pumps. The motor has decent cams, patrick racing cylinders, zipper heads, Dual 45 Mikuni's and built by Kendall Johnson. It runs great for about 10 minutes, then pukes big time out the rear cylinder breather.

Is there anyone out there that can point me in the right direction for finding an after market sportster style oil pump? I'm not into 40K paper weights.

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Old 03-14-2012, 08:54 AM
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Post a pic of that motor, 120" xl whoo hoo
High Performance Racing Engine Crankcases for Harley Davidson Motorcycles FXR Racing and Drag Racing
have you read this. Maybe you should try buying a new 86'-90' oil pump from h-d. what pump is on it now? you dont have a kinked line do you, or maybe you should go over all the lines for shits and giggles
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Old 03-14-2012, 02:01 PM
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Thankfully all the lines are out in the open, and I can't find anything kinked. I talked to a fellow with 2boss performance who builds and races Delkrons all the time that thinks maybe I've not plumbed it right. It doesn't have the buell oil pump with a longer pump body and better scavenging, just a standard sportster style pump.



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Old 03-14-2012, 03:35 PM
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Nice bike by the way Duh, in that delkron attachment, they say to use the 86-90 xl oil pump.
Is that what your using ?
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Old 03-14-2012, 03:40 PM
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Technical Specs
The DR-2 utilizes a dry sump oiling system with the scraper at the bottom and uses the very efficient Harley-DavidsonŽ SportsterŽ (1986 – 1990) gerotor type oil pump for superior oil pressure and scavenging. The DR-2 also has the vastly superior Harley-DavidsonŽ SportsterŽ engine valve train geometry while retaining the strength of the Big Twin flywheel assembly. Camshaft locations are on the same centerline as the stock Harley-DavidsonŽ EvolutionŽ SportsterŽ (1986 – 1990), but moved away from the flywheel assembly, allowing use of the wide variety of cam sets available for these models. Options offered are cylinder bore up to 4.5", cylinder deck height of up to 2" higher than stock, cylinder base bolt pattern, and a fuel pump boss on the timing cover. The pinion shaft is supplied with the case
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Old 03-14-2012, 03:41 PM
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delkron specs

sorry, double post
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Old 03-14-2012, 03:48 PM
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have you taken the back cover off to see if anythings going on up in the head, maybe something keeping the oil from returning to the bottom end. just takin a guess of something simple
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Old 03-14-2012, 03:58 PM
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I dont how delkron packs their shit for shipping, but could be something as simple as saran wrap or something blocking the oil return passage. Just saying, who knows.
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Old 03-14-2012, 06:05 PM
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Quote:
Originally Posted by foggdog View Post
Nice bike by the way Duh, in that delkron attachment, they say to use the 86-90 xl oil pump.
Is that what your using ?
Yes, that's the pump I'm using. I talked to Delkron though, and they said that the scavenge well is small on that block, and the Pro-Flow pump fixes all of the wet sumping problem. I spoke to Rob at 2 Boss Performance, and he's given me some things to check when I get home tonight related to drain back, thinking I might have a problem with the return side drainage. He has built a bunch of these motors, and has never had a problem with using a sportster style pump, even on 7 second drag motors. He said the pump is not the problem. I'm going to be sending him more pictures tonight, so we can talk tomorrow night and start problem solving.

I talked to NRHS, and they have a 98' sportster style pump for the buell with a much better scavenge side that is an option apparently.

Thanks for props on the bike, just won best of show at the Salt Lake AutoRama. Funny thing, I built it to ride, not show, but put it in for the painter. Won 1st place in ground up build class too. I built that beast in my garage with average tools, and parts for my birthday, fathers day, and Christmas. Took me 5 freaking years.
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Old 03-14-2012, 09:17 PM
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Quote:
Originally Posted by foggdog View Post
have you taken the back cover off to see if anythings going on up in the head, maybe something keeping the oil from returning to the bottom end. just takin a guess of something simple
Just did tonight. I'm not sure what to look for, as it seemed the obvious was clear. I was hoping something simple too. Will post pics once photobucket gets working again.
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Old 03-15-2012, 06:35 AM
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here's the bottom R corner of the rocker box,



and the top R, where the breather is, and eventually the oil puking location;



Do those small holes function as the drain back to the cam well?
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Old 03-15-2012, 07:58 AM
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Yes, especially the one on the low side that looks like it full of oil. Thats your problem, it should not be full of oil, somethings blocking the passage it appears to me. (you can see the light reflecting off the oil in the pic on the rear oil return, the front one does not funtion as a return by the diaphram, its just there cause the rocker boxes are able to go on either head.)
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Last edited by foggdog; 03-15-2012 at 08:12 AM..
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Old 03-15-2012, 08:18 AM
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Most likely your gonna have to yank the head and work your way down till you find the problem. Might try using a shop vac, with a small clear hose taped to the vac hose so you get high pressure suction, and slowly work it in that oil return and see if anything comes out. Save from tearing it down.
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Last edited by foggdog; 03-15-2012 at 08:22 AM..
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Old 03-15-2012, 09:04 AM
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wheres the oil filter mounted on that thing ? could have those 2 lines reversed maybe.
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Old 03-15-2012, 09:36 PM
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All very good ideas. I double checked the lines going to the oil filter tonight, and the feed from the pump going to the oil filter is directed to the "in" port on the filter housing. I went over the lines with Rob (the Delkron specialist) and he said I have it right. He told me how to check to see if the oil drain hole is open from the rocker box down to the case. I could run a hard wire all the way down to the flywheels, so it appears the oil should be able to run back to the case. These are zippers heads, and the oil drain is just next to the valve spring. I checked the front head first to get a feel for where the hole was, (those are big springs) I checked the back. Both are wide open, and easily pass the wire without bending. I'm making the assumption that oil should have room to drain based on what Rob said. I'm wondering if that oil we're seeing on those recessed blocks is residual from filling up the rocker box as I was running the motor. Once I stood the bike up, that stuff drained out.

I spoke with Jason at Delkron, who spoke to several builders down at bike week this week, and all of them claim that the Delkron has a small area for all that draining oil to collect into, and the sportster pump is just not adequate to evacuate it. They recommended the Pro-Flow pump or at least the buell pump. I can't find a pro-flow pump anywhere.

Any other thoughts? Thanks for your help bro.....
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