Holber race car gets a new engine. Progress Report
08-14-2008, 06:42 PM
#256
Rennlist Member
I've posted this before, but I'll post it again as the timing seems appropriate, here's the DEVEK engine break-in procedure to go with those headers:
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shutit down, cut open the filter and evaluate, replace filter and go drive the928 for about 100 miles going up and down the revs, at both full and partialloads....and then hit the dyno!Keep in mind that my ring seal is 98% or better before the engine even turnsover...Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
MarcDEVEK
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shutit down, cut open the filter and evaluate, replace filter and go drive the928 for about 100 miles going up and down the revs, at both full and partialloads....and then hit the dyno!Keep in mind that my ring seal is 98% or better before the engine even turnsover...Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
MarcDEVEK
08-14-2008, 07:23 PM
#257
Rennlist Member
Thread Starter
that seems a little extreme. However, I will take it on the highway and run it at 3k and 4k under light loads for a few miles and then, varing loads for the next 500miles. I just hope the thing starts and runs!! It sure feels strange. Lots of compression. very hard to turn over.
Tonight Bill and I tackle the header (the other header is a piece of cake)
then, its just the busy work of putting little stuff back together.
looking to drive it this weekend.
mk
Tonight Bill and I tackle the header (the other header is a piece of cake)
then, its just the busy work of putting little stuff back together.
looking to drive it this weekend.
mk
I've posted this before, but I'll post it again as the timing seems appropriate, here's the DEVEK engine break-in procedure to go with those headers:
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shutit down, cut open the filter and evaluate, replace filter and go drive the928 for about 100 miles going up and down the revs, at both full and partialloads....and then hit the dyno!Keep in mind that my ring seal is 98% or better before the engine even turnsover...Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
MarcDEVEK
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shutit down, cut open the filter and evaluate, replace filter and go drive the928 for about 100 miles going up and down the revs, at both full and partialloads....and then hit the dyno!Keep in mind that my ring seal is 98% or better before the engine even turnsover...Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
MarcDEVEK
08-14-2008, 08:10 PM
#258
Rennlist Member
Thread Starter
one thing im very concerned with are the injectors. George sold me his 30# injectors, and they were supposed to have the correct seals, however, the seals were much larger than the injector seals on the Holbert injectors. The holbert intake manifold might have smaller holes than the stock S4. What i do know is they feel a little loose. How should they fit in the manifold. can you twist them easily in the ports? These are a little looser than the Holbert injectors when we re-use those seals. Im also wondering what injectors these are. can we determine their lb'age by looking up the number on the injector?
a few variables here to work out.
mk
a few variables here to work out.
mk
08-14-2008, 08:24 PM
#259
Rennlist Member
I had my injectors cleaned and flow checked as part of my intake R&R and was very careful with their install. I used vaseline (p.jelly) on new O-rings. The fit in the intake was 'snug' but could easilly be turned; the fuel rail was a gentle push with both hands to seat all 4 at once. I then rechecked all injectors after the rails were torqued down and they could freely spin in situ.
I've had no probs since the rebuild and thats now many Kms ago.
I've had no probs since the rebuild and thats now many Kms ago.
08-14-2008, 08:49 PM
#260
Rennlist Member
Just to clarify on the injector issue:
1) 30lb seals are bigger than holbert
-bigger in what respect, O.D.? thickness?
2) Do the bigger seals fit the manifold or are they too big.
3) 30lb injectors are looser than the holbert injectors when using the holbert seals
-I'd check the OD of the pintle on both injectors and see the difference, it sounds like the new ones are narrower.
I know I can spin my FoMoCo injectors pretty easily, but if I grab them there isn't any play if I try to move them about.
1) 30lb seals are bigger than holbert
-bigger in what respect, O.D.? thickness?
2) Do the bigger seals fit the manifold or are they too big.
3) 30lb injectors are looser than the holbert injectors when using the holbert seals
-I'd check the OD of the pintle on both injectors and see the difference, it sounds like the new ones are narrower.
I know I can spin my FoMoCo injectors pretty easily, but if I grab them there isn't any play if I try to move them about.
08-14-2008, 09:03 PM
#261
Rennlist Member
Thread Starter
Yes, the OD was bigger on the black seals
bigger seals just look too big and will not work on either injector. we even tried pounding the fuel rail, and it was a no go.
30lb injectors are a little looser than the holbert injectors, but they dont move around in a sloppy way, just rotationally. they rotate a little easier. they go into the rails with a little "clump", and seat pretty easy and thats whats worrying me.
I guess we will find out in a few hours. (i hope)
mk
bigger seals just look too big and will not work on either injector. we even tried pounding the fuel rail, and it was a no go.
30lb injectors are a little looser than the holbert injectors, but they dont move around in a sloppy way, just rotationally. they rotate a little easier. they go into the rails with a little "clump", and seat pretty easy and thats whats worrying me.
I guess we will find out in a few hours. (i hope)
mk
Just to clarify on the injector issue:
1) 30lb seals are bigger than holbert
-bigger in what respect, O.D.? thickness?
2) Do the bigger seals fit the manifold or are they too big.
3) 30lb injectors are looser than the holbert injectors when using the holbert seals
-I'd check the OD of the pintle on both injectors and see the difference, it sounds like the new ones are narrower.
I know I can spin my FoMoCo injectors pretty easily, but if I grab them there isn't any play if I try to move them about.
1) 30lb seals are bigger than holbert
-bigger in what respect, O.D.? thickness?
2) Do the bigger seals fit the manifold or are they too big.
3) 30lb injectors are looser than the holbert injectors when using the holbert seals
-I'd check the OD of the pintle on both injectors and see the difference, it sounds like the new ones are narrower.
I know I can spin my FoMoCo injectors pretty easily, but if I grab them there isn't any play if I try to move them about.
08-14-2008, 10:50 PM
#263
Rennlist Member
Mark..........from what you've written all seems well and you've a right to be very cautious.
In my experience the injectors are held 'snug' but not tight.
In my experience the injectors are held 'snug' but not tight.
08-15-2008, 03:36 AM
#264
Rennlist Member
Thread Starter
Well, Bill came over yet again and we knocked out all the tough stuff left to do.
Again, in rookie spirit, we felt bad that we got the driver side devek level II header on in about 20min, so we decided to unbolt it remove it and do it again. Well, not putting the #8 tube on with the 5-6-7 single piece header had something to do with this decision. I dont know why they have the #8 tube to be removeable from the main section, but it has to be installled all together. after that, we put on the other header, alternator console, oil cooler lines, belll housing and some other little things like MAF, some electrical and the exhaust system Its done, except for the radiator and adding the oil .
Now the little stuff, and we will probably get the new and improved Holbert car running on Saturday.
mk
Again, in rookie spirit, we felt bad that we got the driver side devek level II header on in about 20min, so we decided to unbolt it remove it and do it again. Well, not putting the #8 tube on with the 5-6-7 single piece header had something to do with this decision. I dont know why they have the #8 tube to be removeable from the main section, but it has to be installled all together. after that, we put on the other header, alternator console, oil cooler lines, belll housing and some other little things like MAF, some electrical and the exhaust system Its done, except for the radiator and adding the oil .
Now the little stuff, and we will probably get the new and improved Holbert car running on Saturday.
mk
08-15-2008, 03:49 AM
#265
Under the Lift
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Not much left to do. If Mark times it right, this could be a nice way to cap off the Norcal928 funride on Saturday. We should finish the ride about 1pm. I plan to head straight for Saratoga and be there about 2pm. I may drag a few Norcal928'ers along with me.
08-16-2008, 11:25 PM
#268
Under the Lift
Lifetime Rennlist
Member
Lifetime Rennlist
Member
I don't want to steal MK's thunder, but IT RUNS! And it runs rather well. The motor is actually remarkably quiet. No lifter clatter. No piston slap. Idle appears rich, but otherwise it runs very well.
