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Thread: 88mm on a budget!! (Not on budget anymore!!!) New Dyno!!

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Posts: 121-130 of 241
2012-10-17 15:40:30
#121
Originally Posted by ashtonsser
lol ive been saying for a long time that 88mm should be possible on a stock block. lol. The problem at the time was the headgaskets as you would have had to use a 90mm specific headgasket to seal it which on a stock block might not work so great as it will have the firing ring a pretty good distance back from the bore.

Im just surprised it took this long for one or two to get up and running. Its a very simple build and with the extra displacement at really no extra cost, why not? No need to sleeve or any of that.


Head gasket have never been a problem with 88mm builds since I myself did the VVL lubrication externally and I use Cometic head gaskets that are available for SR20DE in 88.5mm bore in different thickness. The myth of the stock sleeve not holding 88mm bore has been broken!!
2012-10-17 16:17:09
#122
This is why we say people need to start trying these kind of things. Theory can only take us so far.
2012-10-17 16:54:35
#123
Not saying its not possible to do 88mm, clearly its possible. But for now, nobody really knows how long it will hold. Lets see after 10-50k miles. But looks like it will be ok as 1mm on the outside isnt too much.
2012-10-17 17:51:26
#124
Originally Posted by gio94sr20ve
Originally Posted by ashtonsser
lol ive been saying for a long time that 88mm should be possible on a stock block. lol. The problem at the time was the headgaskets as you would have had to use a 90mm specific headgasket to seal it which on a stock block might not work so great as it will have the firing ring a pretty good distance back from the bore.

Im just surprised it took this long for one or two to get up and running. Its a very simple build and with the extra displacement at really no extra cost, why not? No need to sleeve or any of that.


If I remember correctly, people did not do these things because they were not sure of the sleeve holding 88 mm. Even though a few N.E guys said it would.
I personally went to a machine shop 9 years ago and the guy said it would not hold a 87.5 mm piston,clearly he was wrong in his personal opinion.



I first stated that it should be fine at 88mm when i dropped a valve shattering the piston in my ve, that put the small end of the rod through the cylinder wall. After looking at how thick the cylinder wall actuall was I mentioned that 88 mm should be fine. Its crazy that it took this long to get one running and done.
2012-10-17 18:24:56
#125
88mm been done before, this little forum is narrow scope when you consider the whole world....
2012-10-17 23:00:06
#126
Originally Posted by Kyle
88mm been done before, this little forum is narrow scope when you consider the whole world....


I thought the BTCC engines utilized a 88mm bore.

There are a few 88mm turbo cars around for some time also.
2012-10-17 23:08:46
#127
Originally Posted by jagy
Not saying its not possible to do 88mm, clearly its possible. But for now, nobody really knows how long it will hold. Lets see after 10-50k miles. But looks like it will be ok as 1mm on the outside isnt too much.


i agree jagy... payu better take care of this one. hes the community's rep on this type of project
2012-10-17 23:34:43
#128
Originally Posted by Payu
Originally Posted by ashtonsser
lol ive been saying for a long time that 88mm should be possible on a stock block. lol. The problem at the time was the headgaskets as you would have had to use a 90mm specific headgasket to seal it which on a stock block might not work so great as it will have the firing ring a pretty good distance back from the bore.

Im just surprised it took this long for one or two to get up and running. Its a very simple build and with the extra displacement at really no extra cost, why not? No need to sleeve or any of that.


Head gasket have never been a problem with 88mm builds since I myself did the VVL lubrication externally and I use Cometic head gaskets that are available for SR20DE in 88.5mm bore in different thickness. The myth of the stock sleeve not holding 88mm bore has been broken!!


I think it is still too early to conclude that the myth has been broken. We need to observe the stresses applied over a longer period of time. Additionally, I think they this may only hold true for the lower cylinder pressure N/A applications.
2012-10-17 23:47:31
#129
yeah, there isnt alot of cylinder wall left at 88mm and definitely wouldnt do a turbo build on one thats for sure. But for n/a purposes I dont think it will have any downfalls.

From my own measurements I took of my chunk of cylinder wall is that the stock cylinder wall is about 3mm thick so 1mm off on each side to bring it to 88mm bore would leave about 2mm of cylinder wall left.
2012-10-17 23:50:42
#130
I am all for progress and improving constantly, a few comments were throwing me off acting like 88mm is a brand new bag.

Originally Posted by SR20GTi-R
Originally Posted by Kyle
88mm been done before, this little forum is narrow scope when you consider the whole world....


I thought the BTCC engines utilized a 88mm bore.

There are a few 88mm turbo cars around for some time also.


Sure were! Nice memory, also. I hope you are catching up on sleep that is much needed and deserved!

88mm x 82mm the BTCC engines were but they have a rev limit of 8500 RPM. Something not all of us have to deal with. (lucky you!) The engine for the BTCC cars was not the strong point. The suspension absolutely crushed the competition. Any time you see videos of the races in the winning seasons they had you can see in the straightaways, the little Nissan was being passed and in corners, it was just carving the other cars/drivers up.
Last edited by Kyle on 2012-10-17 at 23-58-53.
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