comp springs and stock seat/seal

[SappySE107]

I am hoping that John can show these pics to Comp and we can get a definitive answer on the 26915 and similar springs.

ID for the 26915



OD for the stock seat/seal


In place, not full pressure to show the 2nd coil distance.


At 1.7" install height, the 2nd coil won't be moving any more.


Another angle


And a video as well (added since I didnt have a picture showing the fitment without any pressure at all).

http://wot-tech.com/images/26915/springandseat%20010.avi

[Mars]

Hmm, looks OK to me...

[Superdave]

I literally just got done installing some 918's on a set of 3500 heads, they actually fit slightly looser than the 915's did on Redbird's heads. With the Comp retainers and locks i measured 1.75 average installed height.

[SappySE107]

Maybe I need 1 more pic... They don't fit unless you press the spring down onto the retainer.

1.75" install height without modifying anything?

[SappySE107]

http://wot-tech.com/images/26915/springandseat%20010.avi

Video works better for this. I will obviously change my position if comp says that this is ok. The issue to me is no longer that it will create more friction from wearing against the seat since the bottom 2 coils are not going to move once installed at 1.7, but I don't think it should have to be pressed into place to begin with. I am not the spring expert and it is close.

Video is 17 meg. I don't have anything to compress it or anything.

[Superdave]

after it downloads i'll compress it for you and post a link to it.

[SappySE107]

Cool. I just measured and its .024" so my 10-15 thou remark is a bit on the small side but either way, its not much. When compressed with spring pressure, there is no gap, as the pics show

[gectek]

well therein lies the beauty of a mainstream spring not designed for this engine. the stock LS seats are exactly the 3900 seats, smaller od. but comp will prob say set them up for a 1.8 height and it will be ok. i dont think they realize not everyone can take the head off and cut the pocket down. but they are not known for their mechanical incling about much. i will talk to my comp guy but they are going to say they dont have anything and to set them up as such. there are only a few places that make the conical springs, comp is a big dist, then pac, then crow makes some for us, then i think lunati(who is owned by comp) then maybe PSI.....i can talk to them, but they are not going to want to branch out very much just to make us happy in reality.

just need to find a good pn for the US Seal and then have a seat made that will work. i can get the seats made, but they will only be made in bulk. the good news is, i can make them any thickness....but like a thousand at a time....see where this is going?

[Superdave]

http://www.3500z.com/60degree/60V6%20Misc/26918%20vs%20gen3%20seats.wmv

forgive the download speed, that's on my home server.

I have a few LS1 seats around and they do work great. It's just 1 extra step to open them up a little to fit over the guide and then using the 2.2L seals is no big deal.

[gectek]

well the seats are nice but its alot better to have put on parts instead of modify....but i guess you gotta do what you gotta do. and on the 2.2 seats...i have had a few seals come off of my guides before, that is why i like the US Seal vitons...

[Superdave]

when i used the flat SBC shims my 2.2 seals came off.. but that was to be expected with the bottom of the spring moving around.. lol

[gectek]

i used the comp hardened steel seats (.060) and the 2.2 seals and the seats were a perfect fit, just too thick really. about 2 or 3 seals came off

[SappySE107]

its .010" interference fit on the spring. Talk to a Comp tech if you can and if possible, show them these pictures. installed at 1.7, the bottom 2 coils are bound, and not moving so there will be no extra friction. If this is not a problem ,then good deal ,all done. Then only the cheaper LS6 springs need the seals/seats from different motors and we can work with that. Hell, we can work with it either way but I want to know what they say, and not what a salesman says cause I know what their job is already.

US Seal has what we need, but I forget the part numbers. Im going to the shop tomorrow, and I have a note by the laptop to look through their catalog. Besides that, I already have my idea for my ported heads and what I can do to them to make this a no brainer. I want to know more so for those that don't want me to port/modify their heads to be used with a cam and stiffer springs.

I want 0 chance for the seals to pop off and ride the stem.

[SappySE107]

http://www.racingsprings.com/movies/PRI%20Web%201.wmv

More input. That is a lot of movement, and having the seat and spring interference fit at the bottom doesn't look good to me at the moment. I think I was wrong about that 2nd coil not moving anymore.

[Superdave]

I bet they move just as much as the ones in the video with the damper, too bad i don't have a high speed camera or i'd make a video.. lol

I think we're going to switch to the 986 springs and stock locks with the comp retainers and find out how that looks. .500 max lift @ 1.7 IH is useless.