slate blue

Hi to all, I'm slowly building up an engine, are these rods when massaged as per the photo and fitted with ARP 2000 series bolts strong enough for 7500 rpm? They are also heavy, at 850 grams they are no light weights. I suppose when trimmed down will weigh 825 grams?

Any body got any different suggestions? What are the 944 and 951 guys doing? Are they the same rod? Maybe not. I can get the bolts for $250 or less so no big investment, but I don't want to spend money on rubbish rods.

Thanks

BC

This is exactly what I am doing Greg. Forged early 928 rods with ARP bolts. They should really hold together. My idea was to coat the pins and make sure there is enough clearance on the small end so there is no binding under loads. Then maybe cryo freeze them but that stuff is iffy from what I read. I don't see alot of places to lighten them.

mark kibort

the 928 rods seem to be lighter.

slate blue

Hi Mark I'm not sure if I understand your comment, those rods in the photo are 928 rods. They weigh 850 grams as standard. I think I could trim 25 grams off them. Also you might be able to trim some excess off the crank. I contacted Pauter, I spotted a error in their website and they hope to rectify the situation shortly. They told me that their 928 rods would weigh about 700 grams and come with ARP 2000 bolts.

To shave 125 grams off it is going to cost a net of $1750 USD. I think that is pretty dear. Normally the weakest componant are the rod bolts, has anybody ever snapped one of these rods. I have seen the GT rods break, they are truelly crap!

Lagavulin

No doubt, higher-than-stock RPM is expensive!

Do you have a picture of this rod? I have never seen a failed 928 rod outside a 2/6 failure.

All the high-horsepower supercharged engines used stock rods without a problem. The new 6.1L engines in Green Bay are using Carillo's.

mark kibort

the 928 rods are 758 grams. i had a light one at 746 and mark anderson sent me 3 more to chose from to match the existing rods in the block. One of the 2 replacement rods were exactly 758 grams, but the other was light.

the picture of your rods are NOT 928 rods. 928 rods have the 928 number starting the casting number, not 944. (i think!)

so, the stock early rods are for sure, 758grams


MK

heinrich

Greg, talking about massaging rods, and then getting Mark K involved in a "my rod is firmer than your rod" discussion may be hazardous

Lagavulin

Mark, you must be the only one who does not know that those rods came out of a 928 engine; discussions regarding the 944/928 rods have taken place many times in the past.

rob rossitto

fwiw - my 5.85" carrillos only cost $1150 delivered, weigh 600g/good to 600-800hp... EPW, a carrillo distributor in TX sells'em cheap/no tax either for us yankees... 502.937.7258

BC

Technically, we must treat the 928 rods up to about 888 very carefully, as I understand, some are forged and some are sinter forged and some are cast. My 89 rods will go on ebay or into a piece of art or something, as they are too thin looking to me, and they do NOT look like the ones at the top of the thread.

The 944 rods are forged if they have a certain part number. I can't recall right now, but I think its the bottom one. 110. RAST. 83 944 engined had them and 86 and MAYBE 87 951 engines had them. They are technically saught after.

Rob - your rods were cheaper because you have the chevy lenths. You could have gotten 5.85 rods for 400 bucks from summit racing but we won't go there.

mark kibort

Maybe I am

However, I do know that scots rods are lighter and maybe thats the ticket.
i can get the casting number if you want, but anderson has it.
Im almost positive scots rods had a 928 number on the casting number.
anyway, 758grams maybe worth finding a set of these rods and using them.


mk

Lagavulin

It seems that all 87's have the '944' rods as well as at least one '88, Tim's. Based upon that, I would think 'scots' car is at least an '88 or newer.

slate blue

Mark, as Lag says they are 928 rods, the broken rod, (I don't have a pic as the dealer told me about it) broke at its neck. Are you sure on the weights Mark as you have previously responded to me and stated that they were around 850 grams and you said one was 842 grams and you were seeing if Mark A had one that more closely matched the others weights.

Heinreich go and play with your rod, better still have somebody else do it.

What are these 6.1 liter engines I thought I had that idea first!
I was going with a 90.17 mm stroke and a 6.2 inch rod and 104 mm bore.

Lagavulin

These 6.1's are different since the bore is only 101.5mm for structural integrity.

Go here for more details:

https://rennlist.com/forums/928-forum/166901-i-would-like-to-share-my-supercharged-928-project-car.html

Click on the link in the first post to see lots of pictures; they're awesome!

Ok, here's the link to the pics:

http://members.rennlist.com/pageauto/stroker.htm

slate blue

Lag that stuff is awesome! Do you personally know these guys? Those custom Mahle piston are sweet. What do we know about them? E.G their weight and cost are my first questions.

Mark if you could get the numbers that would be great.