FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
|
#1
|
||||
|
||||
IA2 oil flow
So My old motor I ran crower .842 needle bearing lifters, with no restrictors, had excellent oil pressure etc, This new IA Block will be using .904 morel bushed lifters, and they say not to use restrictors, but if I use a vacuum pump which i hope do to, don't i need to limit the oil in that area? This all new to me, with this block and those type of lifters, so it be really helpful to hear from people that are running the IA Blocks with a bushed lifter and also drive it on the street, not just a race only deal, and not with needle bearings as that's a different deal as far as oiling to them .Bullet said they like to see a .100 at least for a restrictor when using these lifters, I've seen alot on here that use a 30-60, but more of those are with needle bearing lifters, When I talked to frank, he said these blocks oil so well he couldn't imagine a .100 hole, but again this is a street / strip deal not flat out for 1320, but i also don't need to fry a lifter or smoke out the neighbors lol, Thanks for any help on this!
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#2
|
||||
|
||||
MR1 block, bushed Crower lifters and no restrictors in my 520 motor. Also ran a vacuum pump the 2 previous years with no issues either. Only header evacs on the 520.
__________________
65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17 63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD) 67 Bonneville ragtop 74 Firebird - 455, e heads, TK0600 in process |
#3
|
|||
|
|||
Darby - Reach out to Bill Meyer. All 3 of my IA motors have bushed lifter bores. He did them all and we've had no problems. Not street driven as you know!
|
#4
|
|||
|
|||
I think that for engines run on the street and with constant extendedRPMs builders like more oil on the top to keep the springs cooled.What I have been told.Tom
|
#5
|
||||
|
||||
Quote:
Exactly what Leech told us to do. We have 800# + over the nose. Jake runs all over hell with his car. We have bushed lifters as well. Brian
__________________
Boobs & bacon |
#6
|
||||
|
||||
Quote:
Do U guys have any restrictor's? What brand of lifters u guys running? What size lifters? Lifter bushings in block also/ U also run a vacuum pump too correct?
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's Last edited by grandville455; 12-15-2017 at 09:13 AM. |
#7
|
|||
|
|||
I have been using Crower Cutaway Severe-Duty solid roller lifters with 0.060" restrictors and a 80 lb oil pump. For the most part street only on this current engine, peak power is at 6000 rpm. While checking the valve lash during a routine check we found one valve would not stay in place, the lash would open up slightly after short use. We removed the intake and found one lifter where the wheel was ground flat enough it had got into the lifter body and it damaged the cam. We checked the valve spring pressure and all was fine, that was not the issue. All the other lifters checked out fine as far as being smooth rolling. These were needle bearing type lifters. They had about 5200 miles on them and we had no clue as to why the one failed.
I sent the lifters to Crower and had them rebuilt with bushings and when talking with Crower they were very adamant about using no lifter bore restrictors. I do not know if they have "Chevy" type oiling system on their mind but I told him I was using a aftermarket IA2 block. We made no changes. But since then I have been told with the bushed type lifter to change the oil often and make sure it is well filtered. .
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#8
|
||||
|
||||
Quote:
Steve ,SO your still using .060 retrictors huh? What does the oiling path look like in IA2 block compared to a stock block, it's different isn't it? Id like to see a chart from one to the other to compare and it will help my engine guy too.
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#9
|
||||
|
||||
Quote:
Brian
__________________
Boobs & bacon |
#10
|
||||
|
||||
Standard cam journals too? Pm me your number, I don't have it anymore.
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#11
|
||||
|
||||
Oiling is pretty much the same as a stock block
|
#12
|
||||
|
||||
So just bigger orifices internally then for more flow? What pump N pan u using Brian?
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#13
|
|||
|
|||
My IA2 is standard cam journal. Bullet Racing Cams solid roller with .4300" lobe lift and 1.65 rocker ratio.
Our engine in the Fairmont is IA2 with a 50mm cam journal. Bullet Racing Cams solid roller with .5000" lobe lift and 1.7 rocker ratio. Both T&D shaft system. Both using Crower Cutaway Severe-Duty solid roller lifters with bushings. .
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 12-15-2017 at 01:22 PM. |
#14
|
|||
|
|||
There are some subtle differences between stock block oiling and an IA II, but the "oiling circuit", is essentially the same. The drillings from the lifter gallery to the main bearings in a stock block are 5/16", nominal. In an IA II, they were reduced to 1/4" to increase strength in the main web. The IA II has an additional drilling from the outside of the block to the #1 main, capped with a 1/8" pipe plug. Stock block does not have this. It can be used to extract oil for turbo cooling for example, or be used to provide external feed oil to the #1 main. The drillings from the oil filter adapter pad are slightly different. The IA II has "cleanouts", in the center of the block where horizontal and vertical drillings intersect. The stock blocks do not and sharp edges can't easily be addressed. That's the only changes I am aware of. The fact that Steve had one lifter fail, only, tells me there was plenty of oil to the lifters. Either the lifter was defective, {very unlikely from Crower), or a tiny piece of crap got in the lifter wheel area and allowed the roller to skip. Once that happens, failure occurs very quickly.
Keep in mind ALL the lifter manufacturers say not to restrict in every application, every engine, every type of lifter. Their single concern is maxilum oil to their lifters. That's all they care about. In a Pontiac engine, a .060" hole in a lifter bushing or a restrictor screw will literally flood the valve train with oil. I just can't imagine needing more oil than that to the top. With a vacuum pump we were able to run .045" restrictors with the pick-up point for the vacuum pump up high in a tall valve cover without any issues. |
#15
|
||||
|
||||
Quote:
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's Last edited by grandville455; 12-15-2017 at 03:18 PM. |
#16
|
||||
|
||||
60lb Melling Select
|
#17
|
||||
|
||||
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#18
|
|||
|
|||
I would think .060" restrictions would still provide plenty of oil to the top, either in the lifter bore or pushrod restrictors. But I am not any kind of expert on extended street use of race engines. I can say just at electric drill speed in a priming scenario, you get lots of oil through the rocker arms with a .060" restriction. Good luck with your build.
|
#19
|
|||
|
|||
This is where the bushing for the lifter bore shines. They can have a cut in the OD of the sleeves and then have two holes intersecting on the flat on the OD of the bushing.
|
#20
|
||||
|
||||
I know my bushed Crowers and a .060 restricter didn't get a long.
|
Reply |
|
|