| Author | Message | ||
     Mrlogix |
Is anyone on here running aftermarket/custom cams? How about head mods? | ||
| Mrlogix |
does anyone know which pins on the DDFI-3 are for the secondary fuel injectors? I know they are there and already configured, but all the pinout diagrams only list spares, nothing denoting pre-allocated for the secondary injectors. Thanks | ||
| Stevel |
Nobody makes cams for these heads. However, I am designing some for myself. I could not locate the lobe profiles I needed, so I am having a set of masters made now. Be aware that there is no physical space for a higher lift beyond 10.5 mm without extensive machine work. That also goes for the valve springs. I've spent the last two years dealing with this issue. My cams will lift 14mm. I have gone to custom beehive ovate wire springs with custom spring retainers and spring seats. Almost nothing is original parts. If you go this route, it is very expensive. IDS has a ECU pin out for J1 and J2 see below. http://idspd.com/xcart/Support-files/IDS_DVCS_Conn ections.pdf | ||
| Mrlogix |
Thanks Stevel, I thought I had looked at the charts on the IDS site. The copy you have has them listed as pins 1 and 21 of J2. I must have looked at an old copy or something. | ||
| Nillaice |
if you deck the heads you will change your valve timing, shifting your power band up in the RPM range. Twin moto/50doro might be a source for 1125 Andrews adjustable cam gears. I heard about them, so I'm pretty sure they made at least few sets http://www.badweatherbikers.com/buell/messages/290 431/667410.html?1328597363 | ||
| Stevel |
Nillaice, I'm not sure where you got that info, but it is incorrect. You would create several other issues though. Like, the throttle bodies not fitting correctly and bad Juju with the timing chain lengths. These motors are not flat head Fords. The adjustable timing gears would be a nice to have. They were made by Andrews for EBR and they were used on some of EBR race bikes and the RS. They were never sold on the EBR site and Andrews would not sell them to me, as the IP belonged to EBR. However, I have the part number somewhere and if any were in stock at EBR (which I doubt) they may be available through LAP now. It's worth a try. | ||
| Mrlogix |
tweaking the CR up a little is done with head gasket thickness/design? | ||
| S21125r |
My memory is a little fuzzy but I think the RS originally came stock with a thicker base gasket which would be changed out during race prep for more compression. Not sure if that presented any TB fitment or timing chain problems but I'm guessing the adjustable gears were added to facilitate retime after swap out. Rob Weaver would know. | ||
| Stevel |
I just tried to get hold of Rob Weaver by email. His email address appears to not be working. If it has changed or if anyone has his phone number, please send me a PM. | ||
| Bullettooth023 |
Vance & Hines has cnc programs for the 1125 and 1190 heads. Plus we can do surfacing and any valve related work you'd want. | ||
| Stevel |
Bullettooth023, The problems with these heads cannot be fixed by removing metal in the ports. The problem is simple, the ports are lazy because there is no venturi before the valve bowl cavities. The cross sectional area below the flange is actually larger than at the flange. The net effect is a loss of already poor column velocity,(caused by the very large port volume) poor turbulence and poor fuel dispersion in the charge. All of which contributes to erratic flame travel. Several other restrictions exist that are even more severe from a performance point of view, like the very shallow valve spring pocket and the limited material below the valve spring base to make it deeper. Making the spring pocket deeper also will reduce the length of the valve guide, which for valve stability, should not be done. The next big issue is the cam to finger follower to valve geometry does not support the higher valve lifts needed. The correct fix for this is a taller head casting with more room for these mods. Anything less is a Band-Aid and compromise. It is possible to increase the valve lift, but it requires a large reduction in the cam base circle diameter, longer valve stems and ovate wire springs. Lastly, oiling is also an issue. | ||
| Bullettooth023 |
Stevel I'm afraid it'snot as simple as you think. The heads themselves flow fairly well from factory but yes there is a mismatch between runners and the port. To get around this we add high strength epoxy in the intake and welding in the exhaust. Then the ports are recut to a specific dimensions based on flow bench data and feedback from EBR. Valve guides are matched to each port to reduce port turbulence as much as possible. Also the chamber is blended to maximize burn. This is not simply a hack job as you think. | ||
| Mrlogix |
bullettooth- I went to the V&H website and tried to find more info, not much I found with any specifics to the 1125 engines or heads. Have any contact info for more info. I have acquired a couple of extra sets of heads and would like to get some work done. Thanks | ||
| Bullettooth023 |
You'd have to call the race shop here in indy and speak with our salesman Ed Krawiec. It's not really listed on our site. | ||
| Mrlogix |
Indy, as in Indianapolis? I'm only about 90 minutes away. Think they would let me come by? Would like to know more about their port mods with epoxies. There design or mine? Out of curiosity, what do you do there? If you don't mind me asking. | ||
| Bullettooth023 |
Mrlogix Correct our shop is on the west side of Indianapolis. I would send you some pictures but I do not have any of an 1125 or 1190 with epoxy. Feel free to pm me and I'll fill you in. Up until recently I was working in the cylinder head department. I did everything from porting to decking heads. I recently moved into more of an engineering roll on a few other projects we have going. | ||
| Mrlogix |
^^ cool, I'll try to pm you. Never used the message function of this site. | ||
| Stevel |
Bullettooth023, Perhaps you misunderstood my post. I said the problems are simple, but certainly not the solutions to them. Adding material to the port however is certainly the key to better and it is encouraging to hear you folks do this. I also agree that the heads flow well from the factory, but then big is always better when measuring air volume at a certain pressure drop through the head, but as I'm sure you realize, that this number is misleading by itself. | ||
| Bullettooth023 |
Stevel, Yes I agree. It also depends on your application. A WOT drag racing setup is going to be different than one for road racing. |
