Twin Turbo Skylark 350 Progress by sean Buick 76

By diyauto
( 2 )

9 minute(s) of a 265 minute read

8-21-2015

Yes I have the Rev limited set at 7500 because I HATE hitting the limiter, I do not think it is good for anything. Ever watch a video of some car bouncing into the rev limited over and over, no thanks. I set it a little higher than my max RPM and I would rather see and extra 200 RPM than bounce of the limiter. So I try to keep it under 7000 but if it goes a little higher oh well.

Like Jay 3000 was talking about recently when I leave the car in drive and let it shift itself it really seems very fast even at part throttle if it shifts at 5000 it just pulls so hard in the next gear that it almost makes you wonder if it is worth it to rev it up over 5000 but only track testing with different shift points could tell us the answer to that.

When the previous owner had this car he spun a rod bearing, and called me... I gave him all the info about the oiling mods, smoothing stress risers on the rods, late vs early rods etc. as well as the ARP part numbers and my advice for a custom camshaft. I am not sure how close he followed my directions but I guess we will see when I take it apart after the next engine goes in.

I have 2 sets of Herche connecting rods for the Buick 350 and they are stock replacement specs so no machine work or BS, they work just like a stock rod but WAY stronger. I have one set for my mild engine that is a fully blueprinted block, internally balanced stock cranksahft, SFI balancer and flexplates, the Herche Rods, Diamond Pistons, ARP studs throughout, Poston 114 cam, Ported iron heads with oversized valves, SP-3 Intake. 355 cubes.




And I have another set of the Herche rods for my girdled engine with the Billet crank and also Diamond pistons in that one. This one will be roller cam and external belt driven oil pump, ported SP-3, and the alum heads with max effort porting. Also 355 cubes






I am looking at ordering a custom aftermarket rear end assembly, it may be a better option than beefing up the 8.5. I am currently going to leave it together as it works well and the 4.56 gears are absolutely crazy for low end pickup, and the 32" tall tires cut down the RPM on the highway to a reasonable number. 4.11 will be in the next rear end though.


8/26/15

I am working night shifts but I managed to find time to get the car on the dyno today quickly before work....

I felt a little bad for the poor original numbers matching 350 so just before the test I lowered the boost to 16 PSI from 20 hoping to keep from spitting the stock rods across the dyno room.

The dyno operator let off the throttle at 3500 RPM as we had a header gasket blow out. So we do not know the peak HP or TQ yet but we did get some good data. The carb was set a little bit lean for a boosted engine so I will dial that in before it goes back. The calculators say that 450 HP at the tires is about 550 HP at the crank. I guess 450 HP at 3500 RPM is pretty good! Was planning to rev to 7000, oh well next time!

It may be a little while till I get it back on the dyno, work and the new little guy are keeping me busy...

Yes it was running great at 7000 RPM yesterday but it is a lot of pressure on everything when running high boost levels.... I have a lot more than 3 Buick 350s though, got a whole stockpile here in case I need em... Going to go get another 350 soon and two 455s. I ship the 455s to my buddy Chris Skaling who builds em up and sells em.


8/27/15

Thanks for the support you guys, I am having a blast driving it! Got the header gasket fixed today and drove it a bunch, then had to go to sleep as I am working nights... It gets a ton of attention, smoked a young guy in Porsche today and at the next lights he hung back about 3 car lengths so I couldn't even see his sad face LOL.

I have a G-tech pro SS in the car and it tells me it is running 11.06 in the quarter mile. Not sure how accurate that is but it must be close. The spedo is still not working but my GPS logged a top speed of 140 MPH on a 3rd gear pull I did on the freeway.

Jay there is a guy by the name of Ethan (V8 user name Hugger) who is going to be making a turbo kit for himself and he has offered to make them for others. He knows his stuff

Yes I am very fortunate to be on one of the only big projects that is busy right now! I am currently taking 11 University Occupational Health and Safety courses to keep my credentials up so hopefully in a few years when this job is over I will get another good one right away.

On a funny note I had my car on the trailer in the parking lot at work the other night and the workers thought it was pretty cool that the Safety guy had a fast car...


8/29/15

Here is a winter project I was working on about 6 months ago... I drove 250 miles each way to get 7 Buick engines.... It snowed like crazy! Had to tow in 4x4 the whole time. I know i needed a lower drop hitch to level the trailer but it towed well anyway.







Got 10 mpg towing in 4x4 not bad..

The roads were still pretty bad yesterday when I went out to drop off the engines.... Most of the way I was able to keep it up to 70 MPH, revving 2500 RPM in 3rd gear is where the engine was happy:






I got them all unloaded at Blake's Shop using his forklift! Blake is the guy who bought my project Skylark and he was in need of a few 455 engines for another car so we worked out a deal where he would drop off the 4 engines to be shipped at the depot for Chris Skaling... And he bought the other two that were not on pallets.





Then I got home and took out my new 68 $50 350:









Mission complete!

Got the car out for another spin, added some more footage to the last youtube video:


9/1/2015

Well I was looking for some intercooler stuff on line and found this Hc5a Holset turbo off of a 20 Liter Kta-19 Cummins engine.

This turbo is brand new remanufactured with 0hrs. Has an upgraded dual vain 41 cm exhaust housing with T6 flange. Both compressor and exhaust wheels are brand new. Center journal bearing section is brand new.

Compressor is 88mm and exhaust is 139mm. Turbo produces 2450 cfm peak. Good for close to 2000hp.

My plan is to use this huge single on the engine dyno to test my good engine when it is done. Shooting to break the 1021 HP world record.

Will keep the two small twins on the car, but just want a big single for testing purposes. Added some better head gaskets to the car tonight. Went great, so easy to work on this car... I know all the wrench sizes and keep em handy!

















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