Author Topic: Flat top- dished pistons Engine rebuild problem (Read 580 times)

Skydancer · « **Reply #15 on:** May 04, 2005, 04:46:21 PM »

My mistake your correct, 147 at the crank. I just dug out the Dyno chart I had done. 130 at the rear which seems right allowing for about 10% loss or thereabouts through transmission.

Cheers:aok

Steve · « **Reply #16 on:** May 04, 2005, 05:14:09 PM »

Quote

I'm looking to build a 1.8L built to 2.0L (bored to 1995cc)

Is that for a motorcycle? VW?

mora · « **Reply #17 on:** May 04, 2005, 05:18:05 PM »

Quote

Originally posted by Skydancer
Yeah Its a 1200 daytona and thats how they build em probly why I'm getting 147 at the rear wheel.

Thanks for the tip been using 95 but will try 97

OK, If it's stock do as Lazs said.

Steve · « **Reply #18 on:** May 04, 2005, 05:18:49 PM »

Lazs, you were right. The guy had the figures wrong. My friend has some software that actually computes the compression for you. It requires you to have a lot of info besides piston and combustion chamber info. Things like deck height, gasket thickness etc. Fortunately we had all that info. The engine will have around 10.4, making it quite driveable.

Nuch I defer to you on compression knowledge.. I don't know that much about it but I have been told by several people that if I was running high compression and added NOS that I'd end up w/ a blown motor.

lazs2 · « **Reply #19 on:** May 05, 2005, 09:00:19 AM »

skyprancer... 10% loss at the rear wheel is a little low even with a belt drive. My buddies Harley loses about 20% from 171 hp at the flywheel to 140 hp at the rear wheel... cars can lose a lot more.

since you had nothing to do with the building of your bike (picking out the color doesn't count) then you should do as the people who did recomend..

lazs

Skydancer · « **Reply #20 on:** May 05, 2005, 09:07:51 AM »

Nope I didn't build this one. I did rebuild the other 1200 Triumph I owned before ( just sold that )

The one I rebuilt I put a thicker head gasket in and trophy pistons which lowered compression. I guess I'll give Triumph a ring see what they recomend. Good thing about buying a home product you can ring the factory tech dept and get an answer.

lazs2 · « **Reply #21 on:** May 05, 2005, 09:10:48 AM »

well... we have lots of factory reps for all sorts of products here. If you lower the compression on a computer controled vehicle then you need to remap it.

as for triumph...

In the old days we used to see T shirts that said "triumph... if they built an airplane would you fly in it?"

lazs

Skydancer · « **Reply #22 on:** May 05, 2005, 09:28:26 AM »

Theres not realy any comparison between the old and the new. I know I got both. A 1960 Tiger 100 and a 1995 Daytona 1200. Chalk and cheese. The new stuff is better put together than a lot of the Jap stuff. At least experience of riding through the kind of sh*tty conditions that leave Jap bikes looking years older than they are whilst my trumpet shines up like a new pin tells me so.

nuchpatrick · « **Reply #23 on:** May 05, 2005, 10:57:07 AM »

Quote

Originally posted by Steve
Is that for a motorcycle? VW?

Steve,

Its for my '94 Mazda Miata, I've built a dedicated track/autocross car. The current motor has 150,000 miles. It's dynoed at 115rwhp which isn't too bad considering the mileage on it. It's a good block. This motor has hydraulic lifters which after long runs at high RPM she starts ticking as the oil get too thin. I'm picking up a '00 solid lifter motor with 60K on it for the new motor work which that new motor will get a complete teardown. It should be a 200rwhp motor..atleast I'm hoping.

lazs2 · « **Reply #24 on:** May 05, 2005, 02:35:27 PM »

well... triumphs may be better these days but we will never know over here since it is rare that we see one... too many people got burned by brit products and too few years have passed since we have..

Ford did make jag into a car that people expect to start most of the time now tho.

lazs

Skydancer · « **Reply #25 on:** May 05, 2005, 05:02:42 PM »

Odd Lazs as the Triumph Riders site I frequent appears to have quite a few US members and the US is Triumph's biggest export market! Still maybe they are still comparatively rare over there. But definately better made and one of the few Brit owned Brit built vehicles left so i'll stick by the home product.

lazs2 · « **Reply #26 on:** May 06, 2005, 08:43:21 AM »

The U.S. has allways been the british bike and autos biggest market. We had more Healeys here than you ever had over there. You even put the steering wheel on the correct side when you made em. We simply don't see many of the new triumphs... I see a group of two or three on the retro twins from time to time but nothing like any other brand.

lazs